Food-grade silicone material: unlike ordinary PVC material straw covers cap, there is no unpleasant smell, you can use it without worry, cleaning it is a breeze! Perfectly compatible: Unlike most straw caps on the market, this straw cover is specifically designed for cup straw. You don't have to worry about the wrong size, perfectly compatible with for 30&40 oz tumbler with handle straws! Leak-proof: prevents the straw from being contaminated by dust and spittle in the air, and also prevents mosquitoes from entering the water cup, keeps the straw and cup hygienic. Precisely: fit for large straws with a diameter of 9-10mm 0.35-0.4inch. Package: Good choice for a gift,this mini cup for cup straw cover,It looks very cute, easy to put on and when using, the is reliable quality. It is the best cups lovers. Colour:As Shown Material:Silica gel Package Contents: 5 * straw lid Only the above package content, other products are not included. Note: Light reflection 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.