... ’s crankcase used magnesium alloy as raw materials, light quality, heat faster.2, GS5000’s starter assembly used magnesium alloy as ... solving the plastic starter easy been broken when starting the machine.3, GS5000’s brake part also used magnesium alloy, solving ... obvious, have the most attraction to market.8, GS5000 have CE,GS certificate. Professional 50cc chain saw with CE certificate