Medela Nipple Shields M 16mm Thank you for viewing. I was given this item, which is almost new, but there was originally a crack on the back of the case. There is no problem with using the nipple shield itself. I tried it on myself, but the size didn't fit, and it has been stored at home since then. It has been sterilized with Milton. It is a set of 2. You can use it temporarily when you have pain or cracks in your nipples, or when your baby can't latch on to the breast properly. If you have any questions, please feel free to message me.