High Density: The size of the metal density Square is 10x10x10 (+/-0.1) mm, which is a 0.39-inch Square. Elemental simple substances with a purity of 99.4-99.9999%, we use vacuum packaging to not only be beautiful, but also maintain their natural appearance and prevent oxidation. Please protect the metal after receiving the goods. This Square is non- and suitable for all ages. Suitable for elements collection, hobbies, DIY, experiments, material display, etc. High-Quality Material: The metal Square is made of high-density elements material, 99.4-99.9999% pure metal, safe and reliable, not easy to deform or rust. This is a practical educational app suitable for different grade levels and also suitable for collecting and displaying elements. Density Squares can be used in a of situations, people can more intuitively understand how elements appear in real life, and their exquisite appearance is suitable for collection. Laser Engraving: Crafted using cutting- for the highest precision. After precision cutting and fine processing, the density is almost consistent with the theoretical data. Important details are engraved on the Square, including chemical symbols, names, atomic numbers, density, purity, atomic mass, melting point and electron shell structure. Explore the fascinating world of elements with accuracy and authenticity. Usage: Density Square can be used in laboratories, offices, science departments, teachers, gifts, science displays, suitable for people of different ages to learn about metals, elements and different densities well. It can be placed in the classroom to stimulate students' interest in chemistry. It can be used as an art collection and is very suitable for elements collection, hobbies, DIY, experiments, and material display. Can also be used as high-purity materials in laboratories. Colour:As Sho Material:Metal Package Contents: 1 set x density Squares Only 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.