The Thinkbaby All in One Set grows with your little one transforming the bottle into the sippy cup and then again into the Thinkster, making it the responsible choice for parents who want to save money and space, while simultaneously protecting the environment from needless waste. All Thinkbaby products are free of - bisphenol-a (BPA), phthalates, nitrosamines, lead, PVC, PET and biologically harmful chemicals. The unique, anti-colic one-piece vented nipple, allows air to flow reducing gas and spit-up and mimics natural breast feeding. The cross-cut design of the nipples, spouts and straws eliminate spills throughout every stage. The All-In-One comes with: 2x Stage A nipple (for 0 to 6 months), 2x Stage B nipple (for 6 to 12 months), 2x 9oz bottle bases, 2x travel tops, 2x sippy handles, 2x stage C-Sippy spouts (9 to 24 months), 2x stage D-Thinkster Tops (18 to 48 months+). All bottle bases are made from polypropylene and spouts from extra soft, medical grade silicone. Easy to clean and dishwasher safe.