High-Quality Construction: The Jmoe USA Leak Proof Spill Stopper set, crafted from food-grade silicone, ensures a safe and healthy drinking experience. Its BPA-free, durable, and long-lasting construction is also dishwasher safe, providing convenience during clean-up. Complete Spill Stopper Set: This set serves as the perfect accessory for your Stanley adventure quencher flow state Cup 2.0, 40oz & 30oz. It includes 2 straw cover caps, 2 square leak stoppers, and 2 round lid leak stoppers, offering comprehensive protection against leaks or spills. This will NOT fit the 1.0 version of the tumbler. Optimal Compatibility: Specifically designed for the Stanley adventure quencher flowstate cup 1.0 40oz and 30oz versions, these spill stoppers provide a snug fit, delivering leak-resistant protection without sacrificing your tumbler's aesthetics. Practical and Functional Design: The set features straw cover caps to deter spills and debris entry, while the square and round stoppers secure a tight seal. Additionally, the stoppers incorporate a cross opening design for an airtight seal and prevents water pour. Easy Installation and Removal: Experience a hassle-free usage with the Jmoe USA spill stoppers, designed for easy installation and removal. This robust, high-quality stopper set effectively eliminates worries about annoying leaks and spills. Dishwasher safe: Place in silverware / cutlery basket.