The foundation of back is10#steel or spcc, CHARACTERISTIC AND SUITABLE SCOPE:The foundation of back is10#steel or spcc, the surface is agglomerated by different trademarks copper and lead powder, Resistant against: tiredness, abrasion, heat, has good carrying capability, especially, be the same with the connecting rod clevel, rocker, gear case, cranking motor, trig chasis, and motor gear case , ...