Easy Operation---Easy to press into materials such as aluminum, pewter, copper, brass, nickel, silver, wood, and leather. These stamps will survive almost any stamping job you can throw at them. Great for permanently marking metals, plastics, leather and wooden items. Use with a basic hammer to permanently engrave names, addresses and other sentiments onto all different types of mediums including jewelry Carbon Steel Metal Leather Working Tools---Made from alloy steel with a sand-blasted finish for strength and clear imprints, even over time Perfect Gift---This leather crafting set has enough variety and it definitely for anyone who likes making leather work. It's a perfect choice for small gifts to family, friends especially for DIY hand stitching lovers. they were super pleased to got it as a gift Widely Use---Works with metal, leather, wood, clay, and more; great for a variety of applications High Quality and Easy Clean---Made of high quality iron for strength and hardness. These attributes reduce wear outs and insures these stamps are long lasting, look beautiful and keep hands clean