Philips nippal material: Silicon, Advanced anti-colic system and BPA free Polypropylene, Extra-soft and flexible teat and Unique comfort petals."Philips avent nipple inside the nipple increase softness and flexibility without nipple collapse. Your baby will enjoy a more comfortable and contented feed. Avent new nipple helps to make bottle feeding more natural for your baby and you. The nipple features an innovative petal design for natural latch on similar to the breast, making it easy for your baby to combine breast and bottle feeding. Avent new nipple helps to make bottle feeding more natural for your baby and you.