10PCS Baseball Straw Cover: These straw covers for stanley cup come in 10 different styles with a 0.4" (10mm) inner diameter, compatible with stanley 30&40 oz tumbler straws and 0.4" (10mm) diameter drinking straws. Please confirm the diameter of the straw before purchasing. Keep Clean & Dust-Free: The straw topper for stanley cup can prevent unclean stuff entering into the straw, clean and sanitary, making drinking more reassuring. Food-grade Material and Reusable: Unlike ordinary PVC material straw covers cap, our straw covers cap is BPA free, and there is no unpleasant smell, you can use it without worry.They're also easy to clean and hand washable and dishwasher safe. Easy to Use: The straw cap has a strip that can be fixed on the straw, and it can still be hung on the side of the straw after opening the cover, so that it will not be lost. Great Stanley Cup Accessories: Great novel gifts! Great for your friends or family. These 10mm straw covers fit perfectly for stanley quencher adventure 30&40oz tumbler.