1) Material: alloy steel 2) All the spare parts have gone through a number of delicate processes and heat treatment. Then they are assembled into chains with automatic machine tools, after the processes of pre-drawing and plating 3) Specifications: 25, 25H, CL04 2 x 3, CL04 3 x 4 and CL04 4 x 5 4) Different specifications and lengths are applicable to different motorcycle models and displacement