Thinkbaby's starter set is free of: bisphenol-A, phthalates, nitrosamines, lead, pvc,tritan, melamine, and biologically harmful chemicals The ultimate in safe and affordable sets, comes with two(2) 5 ounce baby bottles with slow flow nipples, two (2) 9 ounce baby bottles with medium flow nipples, and two (2) fast flow nipples All nipples features our anti-colic venting system to help reduce gas and spit up, nipples also feature cross cut - no spill design Bottles can be easily transformed into our award winning sippy cup through the purchase of the conversion kit, bottles can be easily recycled after use Easy to clean, recommended top rack of dishwasher, anti-colic system built right into the nipple - no parts to mess with