[0.4 Inch Straw Covers - Compatible with Stanley 30/40 OZ tumbler straw and most straws in diameter 0.4 inch (10mm). The perfect choice for friends and family. Please note that the straws are not included in your order. "Food Grade Material - Made of silicone these silicone straw covers are durable reusable and can be cleaned by hand or in the dishwasher. Not only can it be decorated but also can increase children's habit of drinking more water." 6-Pack Cup Shape Design - The 6 Pack reusable silicone straw covers caps set includes 6 Cup Shape straw toppers in 6 colors enough choices that can meet you daily needs. CHOOSE A PATTERN U LIKE! Protect Your Straws - The straw cover can seal your straw so that it can prevent dust when not drinking or prevent drinks from spilling during moving a good helper for outdoor activities. Sales Service - If you have any questions please contact us whatever before purchase or after purchase. We will try our best to solve your problem.]