Pigeon bottles are 100% BPA Free and are made from Polypropylene Plastic. The 160 ml bottle comes with a medium flow (0-3 months) peristaltic teat. Pigeon peristaltic teats feature 2 air holes which work to control the flow of milk. Clear markings provide an accurate measurement guide. The ultra-soft silicone peristaltic teats provide ideal softness and flexibility so baby can latch on easily and the shape fits perfectly onto your baby's tongue, which allows smooth tongue movement while minimizing air intake.