[Idea Companion for Stanley]: Are you still troubled by the leak of stanley tumbler? Our spill stopper set is the best solution, it keeps your stanley cup completely spill proof. [Only for Version 1.0]: Items Including 2 Straw cover, 2 Square Spill Stopper and 2 Round Leak Stopper, only compatible with version 1.0 of stanley cup 40oz & 30oz. [Straw Topper]: The straw tip cover cap prevents water from spilling out of the straw, and can stop debris and dust from entering through the straw. [Round Leak Proof Plug]: Installed in the middle of the inside of the lid for sealing, with a cross opening design to ensure that air enters when drinking water, making drinking water easy. [Square Spill Stopper]: Installed in the straw hole of the lid, it not only forms a seal, but also holder the straw. [High-Quality Silicone Material]: The spill stoppers set of 3 is food grade silicone, reusable, BPA free, dishwasher safe.