SK 8502 Ball Peen Hammer Set, 4-Piece Ball peen hammers are made with tempered alloy steel and are chemically bonded to handles to provide maximum durability and strength New green SK fiberglass handles are 2X stronger and more durable than traditional wood handles Non-slip grips allow for a comfortable hold and maximum striking power Flanged butt design provides additional safety and improved striking force New green SK fiberglass handle