Tungsten alloy sphere is 1" diameter, 0.32lbs. Tungsten is a high density element and surprisingly heavy. Includes certificate of chemical composition and interesting tungsten facts. Machined from aerospace grade tungsten, this sphere is an excellent contemporary addition for your desk at work or side table at home. 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 and Aluminum Cube Sets.