High density quality material: non-, safe, and reliable, with a purity of up to 99.6%. vacuum packaged to maintain a natural appearance and prevent oxidation.Laser engraving: Each Square is engraved with chemical symbols, name, atomic number, density, purity, atomic mass, melting point, and electronic layer structure, with clear edges, flat cutting, and a minimum market tolerance of (+/-0.1) mm.Widely used: Metal Squares can be used in laboratories, offices, science rooms, teachers, gifts, scientific demonstrations, suitable for different ages, with a good understanding of metals, elements, and densities. They can be placed in the classroom to stimulate students' interest. Chemistry can be collected as artwork.: This product can not only be used for collection, but also as a family and friends. It is suitable as a birthday gift, graduation gift, , wedding gift, and other occasions.Colour:As ShownMaterial:copperSize:2.54cmPackage Contents:1 x SquareOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.