high quality aliuminum alloy (ADC12) super-strong hardness low coefficient of expansion 1. high quality aliuminum alloy (ADC12)2.Tensile strength is=196.12 Mpa.3.Super strong hardness 95-130HBCMODE: GS-125, GY6-125, GY-50, GY-60, JH-70, WIN-100, WY-125, AX-100, LS-110, TB-60, DIO-50, CT-50, CD-70, WAVE-110,TB-50, CBT-125. MOTORCYCLE PISTON