Copper Metal 10mm Density Cube 99.95% Pure for Element Collection 10mm density cube made of 99.95% pure copper Each cube made from high purity metal and featuring attractive, ground surfaces and laser etched labels Precision machined for super flat facets and 0.1mm tolerance to come very close to theoretical density Every cube perfectly finished with laser sharp edges and no burrs One of over 60 different pure element density cubes available from Luciteria Science