【COMPATIBLE SIZE】：The Halloween silicone straw cover caps compatible with 30&40 Oz Stanley Quencher H2.0 Tumbler with Handle & Stanley Adventure Quencher Travel Tumbler straw. Also suitable for all types of straws with an outer diameter of 10 mm. Our reusable straw topper covers are tight enough not to fall off easily. Note: Our package only includes 9pcs cute Halloween straw tip caps, straws are not included. Please confirm the straw size carefully when purchasing! 【FOOD GRADE MATERIAL】: Halloween Straw toppers for stanley cup are made of high quality food grade silicone material, BPA free, safe and healthy, reusable, environmentally friendly, durable, hand washable and dishwasher. 【PREVET SPILLS and PROTECT Your DRINKS】Silicone Halloween Straw Top Cover can seal your straws, effectively prevent dust and splashes, keep the straws clean and not wet your items, compact and portable, especially suitable for parties, camping, hiking travel and other outdoor activities. 【EASY to USE】The soft 10mm straw cover is easy to put on and take off, it attaches to the straw and when you open the straw cap to drink, they hang on the side of the straw so you don't get lost. Please note that our packaging does not include straws. 【Creative and Practical】Straw toppers for tumblers unique shape makes it easy to distinguish your cup from others, and avoid drinking by mistake. Keeps your straw clean and no spill. Suitable for silicone straws, stainless steel straws, etc.. Ideal gifts for friends and family. Various Halloween styles for your choose, Skull, Pumpkins, Owls, Cat, Ghosts, Boo, lollipop, Using straw tip lids to welcome the Halloween day, share happiness with your family and friends. 【Compatible with Stanley Tumblers】It's 0.4 in/10mm,perfectly compatible with compatible with Stanley 30&40 oz tumbler straw.They are of just the right size and are not easily detached when used.【Excluding cups and straws】