Piston rings are a big source of friction inside a race engine, and Cup and Nationwide engine builders have gone to great lengths to find the right ring package that has minimal friction while also still providing adequate oil control for a weekend of racing. Viccaro says DHP says the top ring it's currently using is a very high-tech piece of steel. It's 0.119-inch thick and anodized to keep it from welding itself to the piston's ring lands. It's also held to very tight tolerances and, unfortunately, runs approximately $600 for a set. A napier-style second ring is used to help maintain oil control but has very little tension to minimize drag as it travels up and down the cylinder bore.