10 Cube Set: Enjoy the complete collection of 10mm metal cubes, including Tungsten, Titanium, Bismuth, Carbon, Aluminum, Iron, Magnesium, Copper, Zinc, and Chromium. Precision Engineered: These 10mm cubes are non-toxic and safe for all ages. They're crafted with leading technology to produce sharp edges and flat surfaces with the tightest market tolerance (0.1mm). Lab-Grade Purity: Metal cubes boast excellent purity levels, ranging from 99.5 percent to 99.99 percent for various elements. Vacuum packaging preserves their natural appearance and prevents oxidation. Laser Engraved: Each cube is laser-engraved with its chemical symbol, name, atomic number, density, purity, atomic mass, and melting point. Unique Collection: Includes several rare metals. The impressive 11-fold density varies from 1.73 g or cm3 (Magnesium) to 19.3 g or cm3 (Tungsten). Includes a carrying case and element table brochures. Perfect for collectors, classrooms, science experiments, block displays, or educational gifts.