Fiberglass shaft, a soft touch rubber grip, and a two-sided head steel on one side and a replaceable plastic head on the other side The HMR-4 is nominally 2 pounds and is 13.5` long. The steel striking face is about 1-3/8` diameter Replacement Hammer head HMR-4 HMR-4UPC/EAN/GTIN: 763477501721