These rods feature an exclusive ? Parabolic Beam? design that reduces beam stress and delivers the highest strength- to-weight ratio of any connecting rod available. Precision machined using only premium mill certified aircraft quality E4340 chrome moly alloy billets, heat treated to pro duce a 100% martensite grain structure. Continual inspection, statistical process control, batch sampling and fatigue cycle testing assure the finest product obtainable.