Mahle Rings Performance Plasma Steel Top Ring 4.065in x 1.0MM .143in RW HVOF Moly Ring Set

If you're rebuilding the top end of your engine for improved performance, a solid set of piston rings is crucial. This Mahle OE ring set is built for those situations where you need more than just a standard replacement. The top rings are made from plasma-coated steel, which is a tough material that can handle the extra heat and stress of a performance build.

These rings measure 4.065 inches in bore size, with a 1.0mm top ring thickness and a 0.143-inch ring groove width. The plasma coating, applied using HVOF (High-Velocity Oxygen Fuel) thermal spray, adds a hard, wear-resistant surface to the steel. This helps them seal better and last longer, especially when you're pushing your engine harder. They also feature a moly fill for improved lubrication and reduced friction.