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 820 mil (2.08 cm) version of the die with straight edges. 640 mil (1.63 cm) and one inch (2.54 cm) versions of this die also available in the store. The model has been uploaded with color but is only offered is single color materials. You would need to color the part yourself as described above to have additional contrast on the faces of the die.