✨✨✨COMPATIBILITY: Designed specifically for Stanley 40 oz and 30 oz cups, these straw caps ensure a secure fit for your beverage container ✨✨✨DUAL PACK VALUE: Set includes 2 gray shark-themed straw covers, providing a spare or allowing sharing with family members ✨✨✨PERFECT FIT: 10mm silicone opening accommodates standard reusable straws while maintaining a snug seal to prevent spills ✨✨✨INNOVATIVE DESIGN: Shark-inspired topper adds a playful touch while functioning as an effective straw cover to keep debris out ✨✨✨PRACTICAL SOLUTION: Helps maintain beverage temperature and prevents spills while drinking through a straw on-the-go 2Pcs Gray Shark Straw Cap Straw Cover for Stanley 40&30 Oz Cup, 10mm Silicone Straw Covers Cap for Stanley Cup Accessories, Straw Topper, Straw Cap Stopper for Reusable Straws Tip Lids Accessories