This 20 sided die follows the regular numbering
as seen on most gaming dice, in which the numbers on opposing sides always sum to 21. This same design is also available with 'spindown' numbering, to be used as a life counter in games such as Magic: the Gathering here
The die is perfectly balanced to always give a fair roll. The numbers are cut out each face, which makes them stand out well against the surface. The die measures 30 mm (1.2 inch) from side to side, and 37.5 mm (1.5 inch) from point to point.
A slightly smaller version of this die, which is better suited for printing in metal, is available here