STANLEY 56-204 JACKETED FIBERGLASS ENGINEERING HAMMER 4 LBS. IDEAL FOR STRIKING WOOD METAL OR STONE. FIBERGLASS CORE ADDS STRENGTH AND DURABILITY IN THE HANDLE REDUCES VIBRATIONS AND PROVIDES THE ""FEEL OF WOOD"". YELLOW-COLORED SHAFT FOR EASY PRODUCT VISIBILITY. EXCLUSIVE RIM TEMPER REDUCES INCIDENCES OF CHIPPING OR SPALLING.