Hastings Tough Guy Racing Rings are engineered to enhance the performance of high-torque racing engines. They reduce friction, improve heat transfer and oil control, and maxamize the sealing of compression gases. And that means horsepower. Tough Guy Premium Ductile Series top rings are made of high-tensil strength, premium ductile iron torsional and coated with plasma Moly, Second rings are Cast iron reverse twist torsional, oil rings are patented 3 piece Hastings vent flex oil rings.