Natural shape, similar to mothers breast made of rubber. Made of high quality rubber. This pacifier is ideal for parents and babies who use the Cherry Green bottle system. The rubber as a material is durable and soft to the touch, which makes the pacifier pleasant to the lips and teeth. Thick ring to ideally fit the bottle without slipping. designed to use Cherry Green bottles with wide open throat. Available in one size with two different M hole sizes (medium flow rate). Made from safe and 0% BPA materials.