Food grade polypropylene material, SGS Tested and BPA free;Withstand temperature from -4??F to 248 ??F, freezer and dishwasher top rack safe;Nanotech finished interior, smooth surface, leave no residue and easy to clean;All 3 containers come with individual colorful twist-lock secure lids;Screw in the top dispenser lid to any containers and instantly use it as formula dispenser