Transforms your Philips Avent Natural Baby Bottle into a straw cup. Compatible only with the Philips Avent Natural Baby Bottle and Glass Bottle (any size). This kit includes 2 pieces straw top nipples, 2 pieces weighted straw attachement, 2 pieces cleaning brush for the straw, and 2 pieces bottle handles. Bottle not included. | Easy transition since baby is already familiar with the bottle. Soft straw for easy transition. | The straw top nipples are made from food-grade silicone. Does not contain any BPA, Phthalates, PVC, Latex or Lead. | Leak-proof. Gentle on the gums. Variable Flow. Cross-Cut. | Drink at any angle with the weighted straw (cleaning brush for the straw inlcuded). Promote self-feeding and independence with the bottle handles that is included in the kit.