Tungsten Alloy Rod – 0.1875" Diameter x 12" Length, 90% Tungsten, 6% Nickel, 4% Copper - High Density and Hardness for Industrial Use
| Country | USA |
| Brand | HarperCollins Children's Books |
| Manufacturer | HarperCollins |
| Binding | Kindle Edition |
| ReleaseDate | 2016-03-08 |
| Format | Kindle eBook |