The Playtex Drop Ins Liners for Baby Nurser Bottles are designed for babies and are suitable from birth. These anti-colic liners are made of BPA-free plastic and feature a wide neck design. The liners are disposable and pre-sterilized, making them convenient for use. With a capacity of 8-10 oz, these clear liners are designed for easy feeding with a breast-like shape and silicone nipple material. Made in the United States by Playtex, these liners provide a safe and comfortable feeding option for babies.