Material: The straw caps are made of food grade silicone,safety and non-toxic. Can be washed and reused in hot water Package Includes: 6pcs mermaid cover caps in 6 colors(straws are not included), with charming and delicate design, sufficient quantity can meet your daily and replacement needs Size: Each straw cover measures about 10 mm/0.4 inch in diameter, suitable for all straws with a diameter of 8-10mm, Compatible with Stanley 30&40 oz, tumbler Easy to use: The straw topper has a strip that can be fixed on the straw, easy to put on and take off, it can still be hung on the side of the straw after opening the cover, in order to avoid loss Awesome Gifts: Straw covers are featuring the mermaid theme and shaped in diamond fish tails in different colors, shining and eye-catching, perfect gift for your family and friends on birthday, children’s day, Christmas, Halloween, school rewards, etc. they will love it when they receive the gift 6PCS Straw Covers Cap Compatible with Stanley 30&40 Oz Cup, 10mm Mermaid Straw Toppper Tips Lids Protectors for Tumblers, Dust-Proof Drinking Straw Caps for Reusable Straws Tips Lids