All Thinkbaby products are free of – bisphenol-a (BPA), phthalates, nitrosamines, lead, PVC, PET and biologically harmful chemicals. Our baby bottles easily become the sippy with the conversion kit. Simply unscrew the collar of the bottle and place the sippy handles top on the existing bottle, replace the sippy spout with the nipple and screw the collar back into place. The no spill spout on the Sippy features our cross cut design. The extra soft, medical grade silicone spout provides easier transition from baby bottle to sippy cup. Perfect for 9 to 36 months of age. Easy to clean and dishwasher safe. Bottles made from polypropylene and spout from extra, soft medical grade silicone.