Features: 1Adopting high-silicon aluminium alloy with good thermal diffusion ability, greatly improves the efficiency. 2Has a thermal conductivity of 42% higher than that of bimetallic structure, fitting the piston and reduces the weight of the whole machine. 3Through one-piece forming, the piston gaskets have strong machine body as well as great surface hardness. 4The excellent wear resistance, corrosion resistance and high temperature impact resistance ensure stable working. 5Small size and light weight make the convenient installation easier and reduce work difficulty. Package included: 1 x Cylinder 1 x Piston 1 x Piston Pin 1 x Spark Plug 2 x Washer 2 x Piston Ring 1 x Ball Bearing 2 x Cylinder Gasket 1 x Fastening Screw