Canister filled with steel shot in the hammer's head creates a dead blow effect to reduce rebound; Dead blow design also sustains impact, maximizes force, and absorbs the shock of impact; Polyurethane head is resistant to cuts, splits, abrasions, and extremely cold temperatures; Steel handle welded to the head assembly for improved strength and durability; Resistant to gas, brake fluid, anti-freeze and more, with a polyurethane head and rubber handle; Rubber handle has a knurled texture and flared back end for improved non-slip grip