MAHLE Original® gas nitride steel (GNS) piston ring sets are engineered to withstand the extreme punishment of today's high compression naturally aspirated; nitrous oxide injected, turbocharged and supercharged race engines. GNS ring sets provide the overall strength only offered by a steel ring as well as provide high conformability features, reduced ring mass, and less friction. All these benefits will netgreater horsepower and extend the service life of the engine.