Carrillo Connecting Rods are manufactured from a proprietary steel, manufactured and forged to custom specifications. After experimenting with virtually every other reasonable material, Carrillo found a chromium/nickel/vanadium/molybdenum-forged alloy to be the best product to meet the stringent requirements of performance motors. Through out the manufacturing process Carrillo rods are inspected and measured to uphold high quality standards. When you go with Carrillo - you go with quality. Rods sold as a *COMPLETE* Matched Set.