EXCELLENT display of density properties PERFECT for your desk, science classroom, or for every day carry ROUND and heavy with a 1" diameter surprisingly heavy at 0.32lbs or 0.145kg FREE Material Certificate and interesting fact sheet ships with the sphere Machined from aerospace grade tungsten, this sphere is an excellent contemporary addition for your desk at work or side table at home. Surprise your colleagues and friends with the sphere's density, weighing one pound, yet fitting into the palm of your hand. Tungsten is one of the densest naturally occurring elements, and now you can add one of nature's wonders to your own collection. If you like the sphere, don't forget to check out our Tungsten Cube. No base is included with this sphere.