Perfect fit: Only fit Hydro Flask Wide Mouth Straw Cap (OLD VERSION) 24 oz, 32 oz and 40 oz shown in picture. Not fit other brands, not fit narrow standard mouth lid, not fit Wide Flex Straw Cap (new version), not fit coffee lid Size details: The outer diameter is 2.3 inches, the inner diameter is 2 inches, and the thickness is 0.16 inch Value pack: 6 pcs replacement gasket for hydro flask + 1 piece silicone coaster are included. By using our rubber o ring replacement for hydroflask, no need to buy a new lid or a new bottle. It’s time to replace your old seal to keep your lid clean and no leaks Strong seal: The water bottle gasket replacement for Hydroflask is made of high quality and safe silicone with excellent durability and resistance to daily wear and tear. And strong elasticity to ensure long-lasting use of the water bottle, so you can use it with confidence Tips: We are a professional company to produce high-quality water bottle accessories. This is a replacement gasket specially designed for Hydroflask straw lid shown in picture, not fit other brands 6 Piece Replacement Flip Lid Seals + 1 Piece Silicone Coaster