Perfect compatibility, unlike most of the straw covers on the market, the size of this bear straw cover is designed according to the tumbler, so you don't have to worry about the size not fitting.Stylish and practical: This straw topper not only looks cute, but is also practical. It 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.Note: our straw covers is only fit for large straws with a diameter of 9-10mm.Compared to the 12mm straw cap, our straw cover will not loosen when used.if you want to use it for other brands or other sizes of straws, please check the size before purchasing.Safe and healthy materials: unlike ordinary PVC material straw covers cap, our straw covers cap is made of Food-grade silicone material BPA free, and there is no unpleasant smell, you can use it without worry, cleaning it is a breeze!Good choice for a gift:this bear stanley cup straw cover,It looks very cute, easy to put on and take off when using, the main thing is reliable quality. It is the best gift for cups lovers.