We use the latest materials and coatings available to keep pace with the growing trends in engine technology. We offer a variety of materials and coatings for piston rings ranging in diameter from 40mm to 340mm, in a wide variety of profiles and joint types. We offer different versions of piston rings sets to give you a choice of performance and price level. Types of Piston Ring Sets: Plain Cast Iron Piston Ring Sets:These ring sets contain compression rings which are manufactured to precision specifications from high grade grey iron castings Chrome Cast Iron Piston Ring Sets:These ring sets have a top compression ring that is chrome plated for resistance to wear and scuffing. Chrome Steel Piston Ring Sets:These ring sets have a top compression ring that is chrome plated and lapped for resistance to wear and scuffing, and faster seating Moly Piston Ring Sets:These ring sets have a top compression ring which contains a section of 100% pure molybdenum with a melting point of 4730? Fahrenheit (2610? C).