engine piston ring for CUMMINS NT855 
1)139.7mm*3.7+2.9+2.95+4.75 

2)material:nodular iron,cast iron,steel,alloy,and etc(we can do as customer's request)

3)surface treatment:polishing,plating,oxidation,phosphating,nitride,and etc(we can do as customer's request)
4)packing:as customer's request

5) prduct advantage:reduce fuel consumption

We specialized in producing piston rings more than 20years and assembly for kinds of cars, trucks, air compressor engines. Welcome to call or email us for consulting and cooperation