... Ductile Iron 1. Production description: Piston ring, CUMMINS piston ring, CUMMINS 6CT piston ring 2. Something about our corporation CHINA ... , FIAT, DAEWOO, KOMATSU, RENAUL, PERKINS, BENS, CUMMINS, ISUZU, HINO etc.All of our products are made under strictly quality control ... Asia, Africa, America and Europe. We supply full range of CUMMINS piston rings: 6BT 3802421; 6CT 3802429; NT855 3801056; NT855 ...