C.A.T. solid piece push rods are manufactured from cold forged 4130 chrome molly steel with 0.080" wall thickness for high performace and racing application. State-of-art multi stage rolling process to form the perfect ball end shape with higher strength than tubing. All push rods are available in 5/16" and 3/8" in tube diameter with 5/16" end balls. Eight (8) pieces pack in one round cardboard box for accomodating to different ratios of intake and exhaust rocker system and vary length of intake and exhaust valve stem.