It’s a perfect substitute for Stanley cup lid. 3.2 Pcs Reusable Silicone Straw for Stanley 40 OZ Tumbler. 【BPA Material】this lid are made of high quality food grade and white clear PP material, made of food-grade PP material, safe for direct touch with drinks.This lid thick and durable very easy to use, just screw it on and replace your old one easily.