Playtex® Drop-Ins® Pre-Sterilized Disposable Liners are pre-formed so all you have to do is simply place one in a Playtex Nurser and fill it. Sanitary and convenient, these disposable drop-in liners ensure a clean bottle every time and easy cleanup after feeding. Twist on the nipple and ring and you"re ready to feed your baby. Fit in all Playtex 8 ounce Nursers. Liners expand to 10 ounces. Legal Statements: "To Avoid Injury, Do Not Let Baby Walk With Nurser See Packaging For Additional Information "