High quality: This set consists of four high-density cubes, including tungsten, aluminum, titanium, and copper, with a long service life. Copper cube 8.9g Cu 99.95%, aluminum cube 2.7g Al 99.99%, titanium 4.57g Ti 99.5%, tungsten cube 19.16g Wu 99.95%. Density cube: 10mm,+/-0.05mm. High purity, up to 99.99% (non alloy), suitable for element collection and display. Cube contains the information of laser marking, including: number, Chemical symbol, name, density, purity and mass. Metal density cube periodic table element plate is used for element collection, laboratory experimental materials, and display of material blocks. Element cubes are ideal for classrooms, offices, public areas, science departments, and home schools. The element cube is completely handmade without edges. It is very suitable for collection. Each cube is packed in a sealed bag and carried with you Side length: 10mm (approximately 0.39 inches) This package includes: 4 x cubes (copper, titanium, aluminum, tungsten) 4 x acrylic box (for storing and displaying cubes) Colour:As Shown Material:Plastic + Metal Package Contents: 1 set * Element Cube Set 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.