• Wide Use: Stanley cup accessories straw covers are so flexible to fit nearly all types of straws with an external diameter of 9-10 mm (0.35-0.4 inch); straw toppers are universal for Stanley 30 or 40 oz, Yeti, Reduce, Starbucks, Simple Modern, etc
• Food-grade Material: These straw toppers are made from food-grade silicone that are safe, sturdy, and odorless, offering a hygienic drinking experience to you and your friends
• No Leaks and Dustproof: These silicone straw cover caps are tightly seal your water bottle straws, preventing dust and stopping your drinks from leakage
• Easy to Use and Clean: The straw tip covers are so handy to take on and off with a ring that can be fixed on the straw; you don't have to worry about losing them; it is easy to clean up and feels it more sanitary
• 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