【Applicable Size】Our straw covers is fit for stanley large straws with a diameter of 0.4 inch/10mm.if you want to use it for other brands or other sizes of straws, please check the size before purchasing. | 【High Quality Material】Made of high-quality silicone without BPA the straw cap is soft and durable.These straw lid are durable, safe and non-toxic, reusable, hand washable and dishwasher safe. The letter charm accessory is made of premium hardware with quality chain. | 【Easy to Use】These straw plugs can be fixed on straws directly, not easy to fall off.It 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. | 【Portable Straw Lid Kit】You can take it with you and use it where you need it, suitable for various outdoor activities, such as walking on the street, camping, hiking or other activities. | 【STYLES】: The package comes with 2 pack 10mm letter straw covers with 2 pack black and white letter charm chain accessories. The straw topper work for both 30 and 40 ounce Stanley cups and other water bottles or cups with straws in diameter smaller than 0.4". The total length for letter chain is 3.9".