... 35mm 3.High Density,Zero Defects 4.ductile iron piston ring I.Intro:Based on horizontal continuous casting ... 7/600-3/700-2/800-1) ---spheroidization rate 90%,ball diameter 7~8,ball number 400~600/mm2 ... supply related products in blank, such as cylinder liner,piston ring,ADI bushing,sealing ring,suction pipe etc. By ... ... Adapt to strict requirments in precise manufacturing. Piston Ring For Racing Engine