Made of food grade silicone, these straw lid are durable, safe and non-toxic, reusable, hand washable and dishwasher safe. It can prevent dust when not drinking, or prevent drinks from spilling during moving. These straw covers are compatible with stanley tumbler 10mm straws. Please note that there are only silicone straw caps in your package, straws are not included. Made from plastic material, measuring 1.3*1.3 inches, this custom 10mm straw lids. Usage Scenarios: Office supplies, school stationery, corporate promotions, trade show giveaways. Tailored branding: Supports logo imprint and design personalization. Product Highlights: Portable, durable, practical for daily use.