Mahle Rings Performance Gas Nitride Steel 4.355 x .043 .171 RW Plain Ring Set

These Mahle piston rings are made from nitride steel, a material chosen for its ability to stand up to the heat and friction inside an engine cylinder. The rings measure 4.355 inches in bore size, with a ring thickness of .043 inches and a .171 inch oil ring width. This specific set is designed for performance gas applications, meaning they're built to handle the demands of an engine that's working harder than stock.

The nitride treatment on these rings is a surface hardening process that helps them resist wear and maintain their sealing ability over time. This is important because good ring seal is critical for both power and oil control. When the rings seal well against the cylinder wall, combustion pressure stays where it belongs, and oil stays out of the combustion chamber. This set is a solid option if you're rebuilding an engine and need reliable piston rings that can handle a bit more than everyday driving.