This is a set of three silicone nipples (size SS) for baby bottles, which came with the purchase of the Pigeon Breastfeeding Consultation Room. I used these in rotation from the newborn stage up to 2 months, so there is some wear and tear (including yellowing), but I sterilized them each time. - Quantity: Set of 3 - Material: Silicone - Size: SS For those who don't mind used items, I will flatten the nipple part to make them slim for shipping.