Perfectly Compatible: Our Straw Caps Have a Diameter of 10mm (0.4in) & Are Designed to be Perfectly Compatible with a 40 Oz-30 Oz Tumbler with Handle, & for the Simple Modern 40 Oz Tumbler with Straw. They Also Fit All Large-diameter Long Straws with a Diameter of 9-11mm, But Please Confirm the Size of Your Straw Before Purchasing the Straw Cover Cap. Food Grade Material: Made of Food Grade Silicon, These Straw Covers Are Durable, Reusable, & Easy to Clean by Hand or in the Dishwasher. Theyre Airtight & Sealed, Dustproof & Splashproof, Making Them Perfect for Outdoor Activities. Plus, They Can Help Encourage Childrens to Drink More Water. Cute Design & Practical: These Straw Toppers Are Not Only Stylish, But Practical Too. They Effectively Cube Block Dust & Other