PP or polypropylene, is the cost effective material for baby bottles. Polypropylene is used in water bottles and other kitchen accessories. Our PP Boobs offer the best functionality at a competitive price. PP Boobs are BPS, BPA, phthalate and lead free and offer the safe delivery of formula or milk. The Boob has an ergonomic shape that fits nicely in your hand. Each PP Boob is individually shrink-wrapped in a clean room environment to ensure the highest level of cleanliness.