Features 1、Using lightweight high‑silicon aluminum alloy, come with strong thermal diffusion ability 2、The product has a good thermal fit to the piston and reduces the weight of the whole machine. Compared with the bimetal structure, the thermal conductivity is increased by 42% 3、One‑piece forming increase the strength of the machine body and improve the surface hardness 4、Greatly improved wear resistance, corrosion resistance and high temperature impact resistance, you can use with confidence 5、Providing strong gas compression ability, surging power, clear thread and smooth knob, not easy to jam Specification Item Type: Cylinder Kit Material: High silicon aluminum alloy Cylinder Diameter: Approx. 52mm / 2in Package List 1 x Bearing 1 x Cylinder 1 x Piston 1 x Piston Circle 2 x Piston Ring 1 x Piston Pin 3 x Gasket 4 x Fastening Screw 2 x Cylinder Gasket 1 x Transmission Gear 2 x Plastic Tube