1.With heat treatment 2.Pitch:12.70mm 3.Pre-stretched and anti-fatigue 4.Long life duration The Chain technic treatment is as below:1.Shot peening2.Bluing3.Phosphating4.Nickel-plated5.Zincing6.Heat treatment7.Carburizing8.Quenching9.Tempering10.Oiling11.GreasingMain products as the following:1.Motorcycle Chains: 25H (04CH), 415, 415H, 420, 420H, 428, 428H, 520, 520H, 530, 530H, 05MA, 05MB, 05MC, ...