[High Purity] The elemental purity of the tungsten-cube is as high as 99.95%, Lab grade high purity material, almost the best purity you can get in market. [High Precision] The dimensions of the-cubes are 25.4x25.4x25.4 (+/-0.1)mm and 10x10x10 (+/-0.1)mm, which are 1 inch and 0.39 inch.Cubes-are laser-marked with information such as number, chemical symbol, name, mass, density, purity, and more. [Multi-size] contains a 1-inch tungsten-cube and a 0.39-inch tungsten-cube, two different tungsten-cubes, which can better experience the feeling of different sizes and different qualities of tungsten. [Wide use] It can be placed in the classroom to stimulate students' interest in chemistry, can be used as an art collection, and can also be used as a high-purity material in the laboratory. This is a very practical tool. [] The Perfec Gift For Science Teachers, chemistry lover, students, kids and teacher. Colour:As Shown Material:Metal Size:25.4x25.4x25.4mm,10x10x10mm Package Contents: 1set * density-cubes 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.