1.Certification:ISO/TS16949 2.Processing:casting,forging 3.Material:cast iron,steel,aluminum alloy PISTON --AUTO ... piston,concave head piston, top forming piston.AudiCertificationISO/TS16949Mercedes-BendzWorkmanshipgravity casting, squeeze casting, forgingBMWmaterialscast iron, steel, aluminum alloy, composite materialBuickStructurehead,skirt, piston ...