A Must Have for Stanley Tumbler: This spill proof stopper set has a precise design that fits snugly into the spout which suitable for both Stanley 40 oz tumbler with handle and Stanley 30 oz tumbler with handle. No More Leaking: The leak proof stopper is perfect for Stanley tumbler 40 oz, Stanley tumbler 30 oz, Stanley cup 40oz, Stanley cup 30 oz. Spill stopper is a lifesaver for spillage problem which great for 40 oz stanley cup with handle and 30 oz stanley cup with handle. Easy to Install: The spill-proof stopper that can be used for Stanley Cup is easy to install. Perfect for Stanley tumbler 40 oz, Stanley tumbler 30 oz, Stanley tumler with handle 30 oz, Stanley tumbler with handle 40 oz, Stanley tumbler accessories. Wide Application: Particular design for Stanley 40 oz tumbler with handle, Stanley 30 oz tumbler with handle, Stanley cup, Stanley tumbler, Stanley cups, Stanley tumblers, Stanley Quencher H2.0 flowstate tumbler 40 oz, Stanley cup accessories. Ideal Gift: This spill proof stopper compatible with Stanley cup 40 oz with handle, Stanley cup 30 oz with handle, Stanley 30 oz tumbler, Stanley 40 oz tumbler, Stanley tumbler with handle. Material: Silicone, 4 fingers: 2 circles and 2 blades