Feature:1. Excellent lightweight highsilicon aluminum alloy, come with strong thermal diffusion ability2. Come with good thermal fit to the piston and reduces the weight of the whole machine, the thermal conductivity is increased by 42%3. Produced with onepiece forming, increase the strength of the machine body and improve the surface hardness4. Greatly improved wear resistance, corrosion resistance and high temperature impact resistance, sturdy and stable5. This replacement kit come with small size and light weight, reduce the difficulty of work, convenient to useSpecification:Item Type: Cylinder Piston KitMaterial: High silicon aluminum alloyCylinder Diameter: Approx. 44mm / 1.7in.Package List:1 x Cylinder1 x Piston2 x Piston Circle2 x Piston Ring1 x Piston Pin2 x Gasket1 x Bearing