10PCS 4in 3D Straw Covers: These straw toppers fit most 0.4 inch (10mm) diameter straws. Compatible with Stanley 30/40 OZ tumblers. They make great gifts for friends and family. Strictly Selected Materials: Made of food-grade silicone, the straw cover for stanley tumblers are BPA-free, odorless, dishwasher safe and durable. Keep Clean & Dust-Free: This straw caps don’t only looks cute, but is also practical.It can effectively block dust and other foreign objects from entering, a straw stopper that can be used permanently without harming your body, and it's also very cute, you deserve to have it. Easy to Use: These straw plugs can be fixed on straws directly, not easy to fall off, and practical for protecting your straws away from dust. A variety of cute patterns also helped to distinguish the crowd to avoid the embarrassment of holding the wrong cup. Convenient & Portable: Every straw covers for stanley cap comes with a storage case, easy to carry and store. 10PCS 3D Straw Cover Cap for Stanley Cup, Silicone Straw Topper Compatible with 30&40oz Tumbler with Handle,10mm 0.4in Dust-Proof Reusable Straw Tips Lids