Thank you for viewing. This is a set of two Pigeon Breastfeeding Real Feeling nipples, size S. Purchased in June 2024, and used for mixed feeding, leaning towards formula. The silicone of the nipples has started to yellow. They were last sterilized with Milk Pon and stored wrapped. Please be sure to sterilize them before use. They will be shipped without the box, flattened, via Yu-packet Post Mini. I haven't listed them yet, but I also have sizes SS and M.