4 lb. Sledgehammer. Manufactured using the strongest and premium made in U.S.A. hickory, designed to reduce user fatigue, lower vibration and improve efficiency, excellent strength and durability: built, tested and approved to Estwing superior quality and specification, trademark Estwing blue color head with head size and length identifier, drop forged headwith induction hardened (50-55 HRC) striking ends, head weight: 4 lb, overall length: 16"