These are M-size nipples for Pigeon's "Breastfeeding Realization" baby bottles. This is a set of two. I bought these to try a different size because my baby refused the bottle, but they only used them a few times. Sterilized by steam. * No pets & no smokers Instant purchase is welcome. Anonymous shipping. #Pigeon #Pigeon #BreastfeedingRealization #BabyBottle #Nipple #Baby