Fsa afterburner stemour high tech manufacturing processes let us bring the 6061 t6 aluminium afterburner stem in at a low 144g 100mm very light for a mid range stem the raw material is 3d forged and then cnc machined into the final shape features material 3d forged and cnc machined from al6061t6 front clamp 4 bolt cold forged finish sandblasted black with polished black anodized handlebar clamp diameter 31 8mm fork clamp stack height 40mm weight 144g 100mmbuyfsa componentsfrom c