Impact heads: Both yellow: medium-hard polyurethane, colour-fast and wear-resistant compartment: Made of precision steel tube, which is then powder-coated. Shaft: Welded, powder-coated steel tube with ergonomic rubber handle. Standards: “Tested Safety” mark: Tested Safety application: Controlled strikes, e.g. on work pieces in the machine vice or assembly work. Extra: With cast iron balls inside the hammer body for reverse work.