1.compatibility: It is compatible with most straws on the market and can be used without worrying about size issues; 2.Food grade silicone material: Unlike ordinary PVC straw caps, we use food grade silicone material, which has a good texture and no unpleasant odor. You can use it with confidence and it is also very convenient to clean. 3.Leak proof: Prevent the straw from being contaminated by dust and saliva in the air, as well as prevent mosquitoes from entering the water cup, and maintain the hygiene of the straw and water cup. 4.Precision: Suitable for Stanley large straws with a diameter of 8-10mm, 0.31-0.4 inches, dustproof and reusable straw head cover. 5.Packaging: As a great gift choice, this straw cover looks cute and easy to put on and take off when in use, mainly due to its reliable quality. This is the best gift for cup enthusiasts. And our shape is also compatible with holiday Halloween and daily use.