【Mermaid Straw Cover Toppers】package included 4 pcs Mermaid Design Straw Covers for stanley cup. All cover caps are 9-10 mm inner diameter for use with stanley and cup straws. 【Food Grade Material】 The silicone straw cover caps are made of high quality food grade material, safe, non-toxic, odorless, durable and reusable. Safe materials that you can use every day with confidence. It's a must-have accessory and the perfect companion to the Stanley Cup! 【Easy To Use】Our stanley straw tip is designed to fit 40 oz tumblers perfectly. They protects your straw perfectly, effective Dust Protection. Easy to install and remove for hassle-free use. And they are small and easy to carry on a daily basis, especially suitable for outdoor activities. 【Unique Design】These straw covers have various cute shape, add a touch of personality to your stanley cup with cute and trendy designs, stand out with unique accessories. 【Wide Applications】Adorable Mermaid Straw Toppers suitable for various occasions, including walking, camping, and hiking. This Straw Cover is a great addition to any cup straws and makes for a thoughtful gift. Mermaid Straw Covers Cap for Stanley Cup