This gaming die is balanced in the sense that the number holes removed on each face of the die are designed to be of equal volumes and therefore equal weights.
The inside of the die is segmented allowing contrasting colored paints, epoxies, glues, or other fillers to be injected at each face and allowed to dry. You may need to remove excess powder from the internal segments left over from manufacture with a toothpick or curved wire prior to decoration.
This is the 640 mil (1.63 cm) version of the die. 820 mil (2.08 cm) and one inch (2.54 cm) versions of this die also available in the store.