for hydro flask straw lid 32 oz, 12oz, 16 oz, 18 oz, 20 oz, 40 oz, and 64 oz, and most water , the mouth diameter of the bottle is 2.28 inches. NOT compatible with the Hydro Flask Growler, TAL, and Hydrapeak products.Food Grade Silicone: Hydroflask wide mouth lid is composed of silicone valves and silicone straw. The straw is tightly connected to the hydroflask lid. You needn't worry about the straw making an unpleasant sound.More Fit Sealing Ring (99.9% Leakproof): One-handed flip the top, enjoy your favorite cold drink . You can hook the hydroflask top by hand, or place it in a backpack or anywhere for jogging or outdoor travel. No need to worry about water leakage.Safe & Durable: All material is BPA-free, does not affect the taste of your beverage. You can wash it in hot water and it won't deform easily.The mouth diameter of the bottle is 2.28 inches, which is only suitable for the following Wide Mouth Water Bottle:Hydro Flask (12oz / 16oz / 18oz / 20oz / 32oz / 40oz / 64oz)Simple Modern Summit (10oz / 12oz / 14oz / 18oz / 22oz / 32oz / 40oz / 64oz / 84oz) (12oz / 18oz / 34oz / 40oz) (14oz / 18oz / 24oz / 32oz / 40oz / 64oz)Iron Flask (14oz / 18oz / 22oz / 32oz / 40oz / 64oz) (12oz / 18oz / 22oz / 32oz / 40oz)NOT for Hydro Flask GrowlerNOT for HydrapeakNOT for TALNOT for GROWLERNOT for BEER CUP, or TUMBLERThe eco-friendly silicone straw is perfect when the hydroflask is filled with liquid. It fits the lid more tightly, doesn't make any strange sounds, and doesn't deform at high temperatures. (Note: straws are recommended when there is ice in the hydroflask, as the soft silicone straws do not reach the bottom easily.)colour:BlackMaterial:PP+siliconePackage Contents:4 x Leakproof Straw Lids8 x Straws4 x Straw BrushesOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.