Compatible: Unlike most straw caps on the market, this straw cover is specifically designed for stanley cup straw. You don't have to worry about the wrong size, perfectly compatible with stanley 30 and 40 oz tumbler with handle straws. | Precisely: fit stanley large straws with a diameter of 9-10 mm 0.35-0.4 inch.a variety of cute straw cap decorations can be freely paired with Stanley cups, and can also distinguish between family and friends' straws. | Material: unlike ordinary PVC material straw covers cap, and there is no unpleasant smell, you can use it without worry, cleaning it is a breeze. | Leak-proof: prevents the straw from entering by dust and spittle in the air, and also prevents mosquitoes from entering the water cup, keeps the straw and cup hygienic. | Package: 3PCS Sakura Flower Silicone Straw Cover Cap decoration,this mini cup stanley cup straw cover,It looks very cute, easy to put on and take off when using, the main thing is reliable quality. Great for your friends or family.