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 equal 99.5%, tungsten cube 19.16g equal 99.95%. Density-cube: 10mm,+/- 0.05mm. High purity, up to 99.99% (non alloy), suitable for elements collection and display. Cube-contains the information of laser marking, including: Atomic number, Chemical symbol, name, density, purity and atomic mass. Metal density-cube periodic table elements plate is used for elements collection, laboratory experimental materials, and display of material blocks. Elements-cubes are perfect for classrooms, offices, public areas, science departments, and home schools. The elements-cube is completely handmade without sharp edges. It is very suitable for collection. Each-cube is packed in a sealed bag and carried with you These density-cubes are designed for educational environments, rather than ultra high-precision manufacturing. The expected tolerance is within the range of+/-5% of the specified size (although usually more stringent). Due to the properties of the raw material metal, some oxidation may occur during storage. Simply wipe off each layer of oxide to make the cube look completely new. The Density-Cube provides a wide range of educational applications, suitable for all levels of courses, including chemistry, physics, density measurement, specific heat, and gravity research. Suitable for science education projects, including a wide range of activities such as hands-on experimen Colour:As Shown Material:Metal Size:Side length:10mm (approximately 0.39 inches) Package Contents: 1set * cesium metal 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.