1hari

Langkau ke kandungan

Koleksi terbesar dalam negara | Penghantaran percuma ke seluruh negara | Pembayaran selepas dan penyelesaian kerjaya yang mudah tersedia

Cari dengan panjang pakaian
- 1day
  
  Angelcolor Bambi Series
  MOLAK
  EverColor
  ReVIA
  candymagic
  envie
  TOPARDS
  loveil
  feliamo
  FLANMY
  N'S COLLECTION
  LILMOON
  Flurry
  Chu's me
  Lihat semua
- 1month
  
  ReVIA
  MOLAK
  candymagic
  EYEGENIC
  FAIRY
  LILMOON
  Motecon
  TOPARDS
  secret candymagic
  Flurry
  ULTRA MOTECON
  feliamo
  EverColor
  Chu's me
  Lihat semua
- 2week
  
  Victoria 2week
  éRouge
  Neo Sight 2week
  LuMia
  BELTA
  Lihat semua
Cari dengan warna
Cari mengikut saiz (dia)
Menu Ahli

Push!Color | Color Contact Lens

Bahasa
Search
Login
Cart
0 items

Carian untuk
Lihat kedudukan
Berita terkini
Mengenai program ganjaran

Bahasa

Account

Lihat semua warna
Lihat semua jenama

Log masuk
Program Ganjaran
Pendaftaran baru
Senarai kegemaran
Menetapkan semula kata laluan

Notasi berdasarkan perbuatan urus niaga komersial yang ditentukan
Dasar Privasi
Syarat Penggunaan
Syarat Penghantaran
Dasar Pembatalan
Mengendalikan kanta lekap

1 hari
1 bulan
2 minggu

Your cart is empty

Continue shopping

Search Menu

Penjual Terbaik
Semua koleksi
1 hari
2 minggu
1 bulan
乱視用レンズ
シリコンハイドロゲルレンズ
カラータイプ別に探す
クリアレンズ

1hari

Satu hari kanta sentuh pakai buang.
Jenis yang digunakan hanya untuk satu hari dan menggantikan hari berikutnya dengan kanta sentuh baru. Kerana ia adalah kanta sentuh baru setiap hari, ia sentiasa bersih. Ia tidak perlu menjaga dan kebersihan dengan penjimatan masa. Disyorkan untuk mereka yang menggunakan acara khas, sukan, perjalanan, dan lain -lain.

Jenis Lain

1hari

1bulan

2minggu

Filters

Sort by

Ditampilkan

Jualan terbaik

Mengikut abjad, A-Z

Mengikut abjad, Z-A

Harga, rendah ke tinggi

Harga, tinggi ke rendah

Tarikh, lama ke yang baharu

Tarikh, yang baru hingga lama

Jenama

#CHOUCHOU (8)

1-DAY Refrear dolemi (4)

a-eye (14)

Aero Fit 1day (1)

AND MEE (6)

ANGEL EYES (2)

ANGÉLIQUE (6)

ARTIRAL UV＆Moist (3)

BABY motecon (12)

Bambi Series (24)

candymagic (24)

CHALOR (3)

Chapun (9)

Charton (5)

Cheritta (6)

Chu's me (19)

Clainel (4)

colors (14)

COSMAGIA (30)

CRUUM (12)

DECORATIVE EYES (7)

Diya (7)

DOLCE Natural GranDesign (6)

DopeWink (11)

envie (10)

EverColor (36)

Eye coffret (14)

eyelist (6)

EYEMAZING (3)

FABULOUS (9)

FAIRY (12)

FALOOM (4)

Favil (8)

feliamo (16)

Ferenne (6)

FLANMY (23)

Flurry (14)

FruFru (7)

Full Bloom (13)

GAL NEVER DIE (8)

HARNE (8)

Kaica (6)

L-CON 1DAY (2)

LALISH (8)

LARME (7)

Lemieu (6)

LilMe (5)

LILMOON (20)

loveil (21)

LuMia (13)

Luna Natural (5)

Majette (12)

Marble (8)

melady (6)

melange+chouette (7)

melloew (7)

melotte (12)

MerMer (14)

michou (4)

MILIMORE (8)

mimi charme (6)

mimuco (10)

MOLAK (19)

MOTECON ULTRA (12)

Neo Sight (18)

N’s COLLECTION (20)

O&ME (5)

perse (5)

PienAge (9)

Prime 1day (2)

PRIMORE (6)

ProWink (2)

Puppilla 1day Syrup (15)

Pure Natural (2)

Purity (5)

Quprie (9)

ramurie (7)

Refrear (2)

RESAY (6)

ReVIA (48)

RIARIA (3)

secret candymagic (24)

SIE. (7)

Step1 (3)

TOPARDS (21)

Treatee (5)

Trompe-l‘oeil (8)

Twinkle Eyes (7)

U.P.D. (6)

Unrolla (5)

Uyu (3)

Victoria (7)

Viewm (10)

VILLEGE (6)

VNTUS (4)

WANAF (4)

Winkuu (3)

せかいのふるーりー (6)

Series

1DAY Refrear dolemi (3)

#CHOUCHOU 1day (8)

1-DAY Refrear a-eye (14)

1-DAY Refrear Unrolla (5)

AND MEE 1day (6)

ANGÉLIQUE 1day (6)

ARTIRAL UV＆Moist 1day (3)

BABY motecon 1day (12)

Bambi Series 1day (13)

Bambi Series 1day Vintage (11)

candymagic 1day (21)

CHALOR 1day (3)

Chapun 1day (9)

Charton 1day (5)

Cheritta 1day (6)

Chu's me 1day (14)

Chu's me BLUE LIGHT SAVE 1day (5)

Clainel 1day (4)

colors 1day (14)

CRUUM 1day (12)

DECORATIVE EYES VEIL 1day (7)

Diya 1day (4)

Diya Bloom UV Moist 1day (3)

DOLCE Natural GranDesign 1day (6)

DopeWink 1day (11)

envie basic series 1day (6)

EverColor 1day LUQUAGE (11)

EverColor 1day Natural (14)

EverColor 1day Natural MOIST LABEL UV (11)

Eye coffret 1day UV M (13)

eyelist 1day (6)

FABULOUS 1day (9)

FAIRY 1day NATURAL SERIES (4)

FAIRY 1day SHIMMERING SERIES (8)

FALOOM 1day (4)

Favil 1day (8)

feliamo 1day (16)

Ferenne 1day (6)

FLANMY 1day (19)

Flurry 1day (14)

FruFru 1day (7)

Full Bloom 1day (13)

GAL NEVER DIE 1day (8)

HARNE 1day (8)

Kaica 1day (6)

LALISH 1day (8)

LARME 1day (7)

Lemieu 1day (6)

LilMe 1day (5)

LILMOON 0.03ZERO Series 1day (7)

LILMOON 1day (9)

loveil 1day (21)

LuMia 1day (8)

LuMia comfort 1day CIRCLE (5)

Luna Natural 1day (5)

Majette 1day (12)

Marble 1day (8)

melady 1day (6)

melange+chouette 1day (7)

melloew 1day (7)

melotte 1day (12)

MerMer by RICH STANDARD 1day (9)

MerMer by RICH STANDARD GEM Series 1day (5)

michou 1day (4)

MILIMORE EverColor 1day (8)

mimi charme 1day (6)

mimuco 1day (9)

MOLAK 1day (17)

MOTECON ULTRA ONEDAY (12)

Neo Sight 1day Ciel UV (9)

Neo Sight 1day Ring UV (5)

N’s COLLECTION 1day (20)

O&ME 1day (5)

Perfect Series COSMAGIA 1day (19)

Perfect Series COSMAGIA NOVA 1day (11)

perse 1day (5)

PienAge mimigemme 1day (9)

PRIMORE 1day (6)

Puppilla 1day Syrup (15)

Purity 1day (4)

Quprie 1day (9)

ramurie 1day (7)

RESAY 1day (6)

ReVIA 1day (21)

ReVIA Blue Light Barrier 1day (5)

ReVIA Toric (20)

secret candymagic 1day (18)

secret candymagic Toric (6)

SIE. 1day (7)

TOPARDS 1day (18)

Treatee 1day (5)

Trompe-l‘oeil 1day (8)

Twinkle Eyes 1day (7)

U.P.D. 1day (6)

Victoria 1day (7)

Viewm 1day (10)

VILLEGE 1day (6)

VNTUS 1day (4)

WANAF 1day (4)

World's Flurry 1day (6)

Tempoh Memakai | Wearing Period

1day (945)

Jenis Warna | Color Type

BROWN (393)

BLACK (36)

GRAY (141)

PINK (69)

BLUE (48)

OLIVE/KHAKI (34)

CLEAR (18)

BEIGE/HAZEL (128)

PURPLE/LAVENDER (11)

COSPLAY (66)

Reka Bentuk Tepian | Ring Design

BOLD (208)

THIN (245)

DOUBLE (6)

BLURRED (271)

NONE (193)

Diameter Kanta | DIA

14.0mm (86)

14.1mm (59)

14.2mm (348)

14.3mm (3)

14.4mm (18)

14.5mm (374)

15.0mm (57)

Diameter Berwarna | CDIA

11.2mm (1)

11.9mm (1)

12.2mm (1)

12.3mm (1)

12.5mm (5)

12.6mm (8)

12.7mm (4)

12.8mm (20)

12.9mm (4)

13.0mm (72)

13.1mm (14)

13.2mm (88)

13.3mm (46)

13.4mm (56)

13.5mm (97)

13.6mm (131)

13.7mm (98)

13.8mm (111)

13.9mm (27)

14.0mm (78)

14.1mm (6)

14.2mm (10)

14.4mm (2)

14.5mm (6)

14.6mm (15)

14.7mm (1)

14.8mm (21)

N/A (21)

Julat Kuasa | PWR Range

±0.00～ -6.00 (75)

±0.00～ -8.00 (389)

±0.00～ -9.00 (28)

±0.00～ -9.50 (13)

±0.00～ -10.00 (416)

-0.50～ -10.00 (10)

-0.50～ -12.00 (2)

±0.00～ -12.00 (6)

+0.25〜+3.00 (6)

Kandungan Air | Water Content

38.0% (250)

38.5% (117)

38.6% (27)

42.5% (80)

47.0% (34)

55.0% (167)

58.0% (255)

59.0% (7)

60.0% (8)

Bilangan Kanta | Number of Lenses

6 (81)

10 (776)

20 (44)

30 (29)

35 (1)

100 (1)

10, 30 (12)

Spesifikasi | Spec

UV Protection (703)

Moisture-Infused (436)

Blue Light Filter (46)

Toric Lens (40)

Silicone Hydrogel (34)

Farsighted Lens (6)

Thin Lens (10)

Dibancuh dengan Kelembapan (3)

Dibancuh Kelembapan (2)

Dibekalkan dengan Kelembapan (1)

Dibekalkan Kelembapan (1)

Diresapi Kelembapan (4)

Diselitkan Kelembapan (2)

Kanta Torik (1)

Lensa Torik (2)

Penapis Cahaya Biru (4)

Perlindungan UV (11)

Lengkung Asas

8.5mm (61)

8.6mm (588)

8.7mm (259)

8.8mm (33)

8.9mm (4)

harga

¥ to ¥

Pengedar

1-D ROYAL (6)

Ace (7)

AD GOOD (43)

AIRE (19)

aisei (70)

amijes (8)

ANW (31)

ARK (6)

BLUE OPENER (6)

EXILES (2)

FROMEYES (30)

FuRyu (26)

FUTABA corporation (20)

Grand Prix (14)

Glitter Innovation (3)

Intervia (6)

Lcode (160)

Miraile Inc. (3)

M.I JAPAN (15)

NII (23)

PIA (167)

San City (7)

SEED (14)

SHO-BI (21)

Sincere (14)

sweet (42)

T-Garden (130)

Wscale (42)

Wawa (7)

warna ·Lensa Jelas

Clear Lens (16)

Colored Contact Lens (886)

Toric Lens (43)

Pengeluar

AIRE (93)

BLUE OPENER (22)

El Dorado (104)

FROMEYES (45)

Frontier Stage (3)

HYDRON JAPAN (10)

Intervia (90)

M.I JAPAN (38)

Pegavision Japan (240)

Pegavision Corporation (3)

PIA (142)

SEED (14)

SHO-BI Labo (27)

Sincere (37)

YUNG SHENG OPTICAL (56)

アナミジャパン株式会社 (9)

Filters

Sort by:

Jenama

#CHOUCHOU (8)

1-DAY Refrear dolemi (4)

a-eye (14)

Aero Fit 1day (1)

AND MEE (6)

ANGEL EYES (2)

ANGÉLIQUE (6)

ARTIRAL UV＆Moist (3)

BABY motecon (12)

Bambi Series (24)

candymagic (24)

CHALOR (3)

Chapun (9)

Charton (5)

Cheritta (6)

Chu's me (19)

Clainel (4)

colors (14)

COSMAGIA (30)

CRUUM (12)

DECORATIVE EYES (7)

Diya (7)

DOLCE Natural GranDesign (6)

DopeWink (11)

envie (10)

EverColor (36)

Eye coffret (14)

eyelist (6)

EYEMAZING (3)

FABULOUS (9)

FAIRY (12)

FALOOM (4)

Favil (8)

feliamo (16)

Ferenne (6)

FLANMY (23)

Flurry (14)

FruFru (7)

Full Bloom (13)

GAL NEVER DIE (8)

HARNE (8)

Kaica (6)

L-CON 1DAY (2)

LALISH (8)

LARME (7)

Lemieu (6)

LilMe (5)

LILMOON (20)

loveil (21)

LuMia (13)

Luna Natural (5)

Majette (12)

Marble (8)

melady (6)

melange+chouette (7)

melloew (7)

melotte (12)

MerMer (14)

michou (4)

MILIMORE (8)

mimi charme (6)

mimuco (10)

MOLAK (19)

MOTECON ULTRA (12)

Neo Sight (18)

N’s COLLECTION (20)

O&ME (5)

perse (5)

PienAge (9)

Prime 1day (2)

PRIMORE (6)

ProWink (2)

Puppilla 1day Syrup (15)

Pure Natural (2)

Purity (5)

Quprie (9)

ramurie (7)

Refrear (2)

RESAY (6)

ReVIA (48)

RIARIA (3)

secret candymagic (24)

SIE. (7)

Step1 (3)

TOPARDS (21)

Treatee (5)

Trompe-l‘oeil (8)

Twinkle Eyes (7)

U.P.D. (6)

Unrolla (5)

Uyu (3)

Victoria (7)

Viewm (10)

VILLEGE (6)

VNTUS (4)

WANAF (4)

Winkuu (3)

せかいのふるーりー (6)

Series

1DAY Refrear dolemi (3)

#CHOUCHOU 1day (8)

1-DAY Refrear a-eye (14)

1-DAY Refrear Unrolla (5)

AND MEE 1day (6)

ANGÉLIQUE 1day (6)

ARTIRAL UV＆Moist 1day (3)

BABY motecon 1day (12)

Bambi Series 1day (13)

Bambi Series 1day Vintage (11)

candymagic 1day (21)

CHALOR 1day (3)

Chapun 1day (9)

Charton 1day (5)

Cheritta 1day (6)

Chu's me 1day (14)

Chu's me BLUE LIGHT SAVE 1day (5)

Clainel 1day (4)

colors 1day (14)

CRUUM 1day (12)

DECORATIVE EYES VEIL 1day (7)

Diya 1day (4)

Diya Bloom UV Moist 1day (3)

DOLCE Natural GranDesign 1day (6)

DopeWink 1day (11)

envie basic series 1day (6)

EverColor 1day LUQUAGE (11)

EverColor 1day Natural (14)

EverColor 1day Natural MOIST LABEL UV (11)

Eye coffret 1day UV M (13)

eyelist 1day (6)

FABULOUS 1day (9)

FAIRY 1day NATURAL SERIES (4)

FAIRY 1day SHIMMERING SERIES (8)

FALOOM 1day (4)

Favil 1day (8)

feliamo 1day (16)

Ferenne 1day (6)

FLANMY 1day (19)

Flurry 1day (14)

FruFru 1day (7)

Full Bloom 1day (13)

GAL NEVER DIE 1day (8)

HARNE 1day (8)

Kaica 1day (6)

LALISH 1day (8)

LARME 1day (7)

Lemieu 1day (6)

LilMe 1day (5)

LILMOON 0.03ZERO Series 1day (7)

LILMOON 1day (9)

loveil 1day (21)

LuMia 1day (8)

LuMia comfort 1day CIRCLE (5)

Luna Natural 1day (5)

Majette 1day (12)

Marble 1day (8)

melady 1day (6)

melange+chouette 1day (7)

melloew 1day (7)

melotte 1day (12)

MerMer by RICH STANDARD 1day (9)

MerMer by RICH STANDARD GEM Series 1day (5)

michou 1day (4)

MILIMORE EverColor 1day (8)

mimi charme 1day (6)

mimuco 1day (9)

MOLAK 1day (17)

MOTECON ULTRA ONEDAY (12)

Neo Sight 1day Ciel UV (9)

Neo Sight 1day Ring UV (5)

N’s COLLECTION 1day (20)

O&ME 1day (5)

Perfect Series COSMAGIA 1day (19)

Perfect Series COSMAGIA NOVA 1day (11)

perse 1day (5)

PienAge mimigemme 1day (9)

PRIMORE 1day (6)

Puppilla 1day Syrup (15)

Purity 1day (4)

Quprie 1day (9)

ramurie 1day (7)

RESAY 1day (6)

ReVIA 1day (21)

ReVIA Blue Light Barrier 1day (5)

ReVIA Toric (20)

secret candymagic 1day (18)

secret candymagic Toric (6)

SIE. 1day (7)

TOPARDS 1day (18)

Treatee 1day (5)

Trompe-l‘oeil 1day (8)

Twinkle Eyes 1day (7)

U.P.D. 1day (6)

Victoria 1day (7)

Viewm 1day (10)

VILLEGE 1day (6)

VNTUS 1day (4)

WANAF 1day (4)

World's Flurry 1day (6)

Tempoh Memakai | Wearing Period

1day (945)

Jenis Warna | Color Type

BROWN (393)

BLACK (36)

GRAY (141)

PINK (69)

BLUE (48)

OLIVE/KHAKI (34)

CLEAR (18)

BEIGE/HAZEL (128)

PURPLE/LAVENDER (11)

COSPLAY (66)

Reka Bentuk Tepian | Ring Design

BOLD (208)

THIN (245)

DOUBLE (6)

BLURRED (271)

NONE (193)

Diameter Kanta | DIA

14.0mm (86)

14.1mm (59)

14.2mm (348)

14.3mm (3)

14.4mm (18)

14.5mm (374)

15.0mm (57)

Diameter Berwarna | CDIA

11.2mm (1)

11.9mm (1)

12.2mm (1)

12.3mm (1)

12.5mm (5)

12.6mm (8)

12.7mm (4)

12.8mm (20)

12.9mm (4)

13.0mm (72)

13.1mm (14)

13.2mm (88)

13.3mm (46)

13.4mm (56)

13.5mm (97)

13.6mm (131)

13.7mm (98)

13.8mm (111)

13.9mm (27)

14.0mm (78)

14.1mm (6)

14.2mm (10)

14.4mm (2)

14.5mm (6)

14.6mm (15)

14.7mm (1)

14.8mm (21)

N/A (21)

Julat Kuasa | PWR Range

±0.00～ -6.00 (75)

±0.00～ -8.00 (389)

±0.00～ -9.00 (28)

±0.00～ -9.50 (13)

±0.00～ -10.00 (416)

-0.50～ -10.00 (10)

-0.50～ -12.00 (2)

±0.00～ -12.00 (6)

+0.25〜+3.00 (6)

Kandungan Air | Water Content

38.0% (250)

38.5% (117)

38.6% (27)

42.5% (80)

47.0% (34)

55.0% (167)

58.0% (255)

59.0% (7)

60.0% (8)

Bilangan Kanta | Number of Lenses

6 (81)

10 (776)

20 (44)

30 (29)

35 (1)

100 (1)

10, 30 (12)

Spesifikasi | Spec

UV Protection (703)

Moisture-Infused (436)

Blue Light Filter (46)

Toric Lens (40)

Silicone Hydrogel (34)

Farsighted Lens (6)

Thin Lens (10)

Dibancuh dengan Kelembapan (3)

Dibancuh Kelembapan (2)

Dibekalkan dengan Kelembapan (1)

Dibekalkan Kelembapan (1)

Diresapi Kelembapan (4)

Diselitkan Kelembapan (2)

Kanta Torik (1)

Lensa Torik (2)

Penapis Cahaya Biru (4)

Perlindungan UV (11)

Lengkung Asas

8.5mm (61)

8.6mm (588)

8.7mm (259)

8.8mm (33)

8.9mm (4)

harga

¥ to ¥

Pengedar

1-D ROYAL (6)

Ace (7)

AD GOOD (43)

AIRE (19)

aisei (70)

amijes (8)

ANW (31)

ARK (6)

BLUE OPENER (6)

EXILES (2)

FROMEYES (30)

FuRyu (26)

FUTABA corporation (20)

Grand Prix (14)

Glitter Innovation (3)

Intervia (6)

Lcode (160)

Miraile Inc. (3)

M.I JAPAN (15)

NII (23)

PIA (167)

San City (7)

SEED (14)

SHO-BI (21)

Sincere (14)

sweet (42)

T-Garden (130)

Wscale (42)

Wawa (7)

warna ·Lensa Jelas

Clear Lens (16)

Colored Contact Lens (886)

Toric Lens (43)

Pengeluar

AIRE (93)

BLUE OPENER (22)

El Dorado (104)

FROMEYES (45)

Frontier Stage (3)

HYDRON JAPAN (10)

Intervia (90)

M.I JAPAN (38)

Pegavision Japan (240)

Pegavision Corporation (3)

PIA (142)

SEED (14)

SHO-BI Labo (27)

Sincere (37)

YUNG SHENG OPTICAL (56)

アナミジャパン株式会社 (9)

945 products

Latte Beige [FABULOUS] | 1day

Sale priceCHF 14.82

RIARIA 1day

Ariagure | 1day

Sale priceCHF 13.16

RIARIA 1day

Siri Albeju | 1day

Sale priceCHF 13.16

RIARIA 1day

Roti perang sebenar | 1day

Sale priceCHF 13.16

melloew 1hari

Trufle | 1day

Sale priceCHF 11.24

melloew 1hari

Mokapawder | 1day

Sale priceCHF 11.24

melloew 1hari

Labah-labah | 1day

Sale priceCHF 11.24

FruFru 1day

NOEL BROWN | 1day

Sale priceCHF 13.32

FruFru 1day

LUNA BROWN | 1day

Sale priceCHF 13.32

FruFru 1day

AMANE BROWN | 1day

Sale priceCHF 13.32

FruFru 1day

MANA GRAY | 1day

Sale priceCHF 13.32

FruFru 1day

SUZUKA OLIVE | 1day

Sale priceCHF 13.32

FruFru 1day

KAREN BROWN | 1day

Sale priceCHF 13.32

FruFru 1day

YUI BROWN | 1day

Sale priceCHF 13.32

Uyu 1hari

Darkvani | 1day

Sale priceCHF 13.32

Uyu 1hari

Koko adalah coklat | 1day

Sale priceCHF 13.32

Uyu 1hari

Kecantikan | 1day

Sale priceCHF 13.32

GAL NEVER DIE 1hari

Hottee | 1day

Sale priceCHF 12.49

WANAF 1hari

Selenggaraan | 1day

Sale priceCHF 13.32

perse 1hari

Sanibea | 1day

Sale priceCHF 12.90

Step1 1hari

Amerika-Gréka | 1day

Sale priceCHF 13.32

Step1 1hari

Big・Brown | 1day

Sale priceCHF 13.32

Step1 1hari

ザ・Hitam | 1hari

Sale priceCHF 13.32

DOLCE Natural GranDesign 1hari

Dulche Sircle Black | 1day

Sale priceCHF 12.07

5 / 40

Shop Profile

The Best Japanese Colored Contact Lenses Store
Cute Eyes, Countless Choices; 1000+ Colors to Match Every Mood💗

〒106-0041
1-11-10 Azabudai, Minato-ku, Tokyo
6F, Nisso Dai-22 Building
License for the Sale of Highly Controlled Medical Devices：6港み生機器第190号

Quick Links

Carian untuk
Lihat kedudukan
Cari warna
Berita terkini
Mengenai program ganjaran
Menu Ahli
Senarai Terma dan Syarat

MAIN MENU

#Handling kanta lekap
#Notasi berdasarkan perbuatan urus niaga komersial yang ditentukan
#Terms penggunaan
Dasar #Privacy
Polisi #Refund
Dasar #delivery
Hubungi

Daftar untuk cerita baru dan tawaran peribadi

Dengan mendaftar untuk surat berita, anda akan menerima makluman mengenai warna baharu dan kupon diskaun.

Alamat e-mel

Bahasa