Function: High-End Penis Pump Cylinder Seal DonutColor: bLACKSize: S: 7.3 cm/2.8 in (Suit for 1.75-2 inch Cylinder )M: 8.3 cm/3.2 in (Suit for 2.25-2.5 inch Cylinder )Power: NoMaterial: SiliconePackage: Color Box/OPP Bag