Forged using high tensile strength SAE 4140 chrome moly hardened and tempered steel,. Rods have wrist pin bushing pressed in, oil holes drilled, and rough bored. Rods are sold individually without the insert bearings. Order the needed size of bearings in addition to the rods. When 4 rods are ordered, they will be weight matched. These Model A connecting rods are made to accept the A-6204 style of insert bearings that wrap around the edges. Sold in sets of 4