This is a dedicated nipple for Icreo liquid paper pack milk. I purchased this for use when going out, but my baby didn't latch onto it well, and only used it once. It has been sterilized and stored at home. Although it has been sterilized, it is something that your precious child will put in their mouth, so please be sure to wash it before use. Also, it is a beautiful item, but please purchase only if you understand that it is a used item. Thank you for looking.