Xtremeglas Water Bottle Replacement Lids for Xtremeglas Hydrate and Xtremeglas Duo Water Bottles Replacement lid with silicone O-ring for Xtremeglas water bottles Lids are interchangeable between Hydrate and Duo bottles Stainless steel is made from 18/8 or 304 food grade material Plastic threads are BPA free food grade plastic