Pigeon Nipple - Real Feel SS size x 1 (used for 2 months) S size x 2 (1 used for 2 months, 1 new) M size x 3 (all new) After use, I washed them with Pigeon bottle wash and sterilized and dried them each time with Pigeon's Potchitto. There are no problems with use, but the SS size nipple has some yellowing. There are no noticeable scratches or stains, but I think there is some discoloration and signs of use due to sterilization and use. I will wash, sterilize, and dry them again before shipping. Please note that I will compress the tips to make them compact for shipping. Please understand that these are used items before purchasing.