Compatible with Stanley Tumblers : Straw covers come in 12 different style with a 0.4" inner diameter, compatible with stanley 30 oz/40 oz tumbler straws and most of 0.4" diameter drinking straws. Please confirm the diameter of the straw before purchasing Reusable Straw Tip Covers : Made of silicone material, no smell, soft and can be used for a long time.Plus, they're easy to clean and hand washable and dishwasher safe Nurse Accessories for Work: The set of 12 nursing-themed straw lids come in an adorable design to decorate most straws and are suitable for nurse gifts Easy to carry & Good Protection: Our Silicone Straw toppers can perfectly cover your straw. Effectively dustproof and spill proof. It can be fixed on the straw and can still be hung on the side of the straw after opening the cover. Prevent loss and easy to use.Keep your straws cleaning!They are small in size and convenient for daily carrying, especially suitable for outdoor activities, walks, and camping. Ideal for All Occasions: these cute straw covers are perfect for outdoor activities and adventures , featuring a stylish nurse design, these straw covers are both cute and decorative. They are ideal gifts for family members This set of straw covers fits Stanley Quencher H2.0 30oz and 40oz tumblers and is also compatible with most straws of the same diameter. The inner diameter of the straw topper is 0.39 inches (10 mm)