【Must-Have Accessory for Stanley Tumblers】Perfect Fit--Designed specifically for Stanley H2.0 tumblers (20oz,30oz and 40oz). Prevents Spills--Upgrade your stanley with spill-proof stoppers set, Say Goodbye to Spills, Just enjoy your favorite beverage worry-free. 【No More Spills】Very easy to use, just put round stopper in the center of lid and wingled spill stopper in the straw hole of lid (Both them were installed in the inside of lid). Then put on straw covers,DONE! Simple three pieces to prevent from spilling.No longer worrying about spills! 【Air Inlet Design】we have self-closing Air inlet design in round stoppers, which not only prevent water leaking when you drink, but also allows air flow to suck easily. Enjoy your tumblers with no leaking & easy drinking.No annoying hard to drink! 【Food Grade Material】The spill proof sets including 2 round Stoppers,2 winged spill stoppers and 2 straw covers. all made of premium food-grade silicone, BPA free, odorless, easy to clean, dishwasher safe. 【Wing Shape Spill Stopper】The winged spill stoppers could well seal straw hole of lid for spill proof and its special shape could prevent itself fall off into the cup while in use. Stanley spill stoppers set include 2 pcs round leak stoppers, 2 pcs wingle spill stoppers and 2 straw covers. Fit for Stanley H2.0/1.0 quencher 40oz/30oz tumblers.Caution: which designed for Stanley Quencher series but not fit for other Stanley series or other brands tumblers. The leak proof stoppers set made of Food grade silicone, BPA free, odorless, easy to clean, dishwasher safe.