I attended a breastfeeding clinic, so I hardly used any commercially available nipples (I bought and used the clinic's special nipples). If anyone is interested, please take them. M size: 4 pieces (1 new) SS size: 2 pieces They are relatively clean, but this is based on my personal opinion, so please refrain from purchasing if you are sensitive to this. New ones will be sent in a small bag. Since they have been used, I have marked them as "slightly scratched or dirty." I will flatten the nipples for shipping, so please understand.