Description:[Material] Made of soft rubber, all the seal rings are durable and sturdy for long time usage.[Easy to Install] Quick and easy install waterproof gasket protects your water toilet tank perfectly. When compressed against a material, the washer prevents water, air, or anything else from coming in or out. Waterproof gasket protects your water tank perfectly.[Protection] The toilet bolt tapered washer creates an air-tight seal between the bolt or screw and the hard surface, and also insulates and reduces vibration by acting as a buffer between the fastener head and the materialSpecification:Size: 24.5x10mm/0.96"x0.39"(DxH)Package Contents:20 pieces of the toilet tank to bowl bolts washers.