I am selling these because I didn't use them. One has been opened, but the nipple is unused. The other is still sealed. Silicone nipples for baby bottles that provide a sensation similar to breastfeeding, size SS, suitable from 0 months. - Brand: pigeon - Model: 母乳実感 (Bonyu Jikan) SS size - Target age: 0 months and up - Quantity: 1 piece x 2 - Material: Silicone rubber Thank you for looking.