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Stainless Steel/Iron/Copper METAL TEXTURE: We use some recycled gears, rivets, brass rings, copper tubes and mechanical parts and decorate them with electronic parts, through the exquisite combination of design, to create our own cool mechanical model. COOL DECORATIONS: 3D metal model kit. cnc craft casting, collectible craftsmanship, real machine craftsmanship, start your adventure in the world of mechanical engineering with this model decorations! EASY TO ASSEMBLE: This 3D metal puzzle kit includes detailed instructions, easy to assemble,. VALUE: 3D metal puzzles not only exercise hands-on skills and creativity, but also help to develop logical thinking and improve attention and concentration. NICE GIFT: This 3d metal jigsaw puzzle kit is a great stress reliever and a good gift for your friends or yourself on birthdays, Christmas, Halloween, Easter, Thanksgiving and other happy moments.