Item Type: Cylinder Piston Kit Material: High silicon aluminum alloy Cylinder Diameter: Approx. 38mm / 1.5in 1The kit contains parts such as cylinder, piston, piston rings and clips, suitable for Stihl MS171 MS181 MS181C MS211 1139 020 1201. 2Made of light weight high silicon aluminum alloy, with strong thermal diffusion ability and good thermal fit for the piston. 3One piece molding design improves the surface hardness, has abrasion resistance and high temperature impact resistance. 4With strong gas compression capabilities, provides surging power, and is not easy to freeze. 5The cylinder diameter is 38mm, the size is standard, the matching degree is high, and can replace old or broken cylinder. 1 x Cylinder 1 x Piston 2 x Piston Rings 2 x Piston Clips 1 x Piston Pin