Perfect Combination：Our replacement glass cup lid is 【ONLY suitable for Stanley 40oz cups】. To avoid you buying a lid with the wrong size, please confirm the size carefully when purchasing Safe Material：Our products are made of AS and PP, BPA-free, lightweight but strong enough to be safely placed in your cup Spill-Proof Design： The 40 oz cup lid has a straw opening designed to prevent splashing, and the seal holds the reusable straw in place Easy To Use：This replacement lid is designed with a sliding button, which is easy to close or open with one hand Airtight: The travel cup lid fits tightly to the cup with a good airtight seal to prevent spills or leaks and insulation 40 OZ Tumbler Lid Compatible for Stanley