Solve the problem of unsuitability: When purchasing a straw cover, are you concerned about the size not being suitable for multiple different of straws or cups. The adjustable straw cap can help you solve it. This is a great . Fit of Straw: design with adjustable internal diameter (6mm-10mm). Suitable for of for , for Simple Modern, for , for , for , for Reduce, for Maars, for Meoky, for MaxBase, for Beast, for and so on. limitid. Food Grade Material: Made of the same food grade silicone material. durable, safe and non-, reusable. Dustproof and splashproof, especially suitable for outdoor activities. Hand washable and dishwasher safe. Leak-proof & Dust: prevents the straw from being contaminated by dust and spittle in the air, and also prevents mosquitoes from entering the water cup, keeps the straw and cup hygienic. Colour:translucent Material:Silica gel Package Contents: 4 x Suction straw dust plug Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.