Features Lightweight high‑silicon aluminum alloy is adopted, come with strong thermal diffusion ability The thermal conductivity is increased by 42% compared with the bimetal structure, and has a good thermal fit to the piston and reduces the weight of the whole machine, very stable Adopt one‑piece forming, increase the strength of the machine body and improve the surface hardness Wear resistance, corrosion resistance and high temperature impact resistance is greatly improved, very durable This replacement kit come with small size and light weight, reduce the difficulty of work, very convenient Specification: Item Type: Cylinder Piston Kit Material: High silicon aluminum alloy Cylinder Diameter: Approx. 40mm / 1.6in Package List: 1 x Cylinder 1 x Piston 1 x Piston Circle 1 x Piston Pin  2 x Piston Ring Package List 1 x Cylinder 1 x Piston 1 x Piston Circle 1 x Piston Pin 2 x Piston Ring