We are factory manufacturing piston, piston ring and cylinder liner. The principle function of piston ring is to form a seal between the cumbustion chamber and the crankcase of the engine. The goal is to prevent combustion gases from passing into the combustion chamber. Cnflap Engine Parts (GZ) Limited supplies various of types on piston rings of tractors, trucks, cars and generators etc. There are plenty of sectional shapes, treatments/finishes optional. If there are any needs on piston rings, pls feel free to contact me.