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