This is a set of Pigeon's Breastfeeding Real SS and S nipples. Both were sterilized with disinfectant solution. The nipples have turned yellow, but I believe they can still be used without any problems. However, since these are used items, please understand this before purchasing. As a bonus, I will include two Chuchu tablet-type sterilizing tablets. (Please let me know if you don't need them.) The items will be shipped without the original box, folded to a smaller size, and placed in a Ziploc bag.