The faces with fewer pips (3, 2, and especially 1) have slightly lower frequency than those with more pips (4, 5, and especially 6), since more pips means slightly less mass near that face.
I have seen dice that try to partially fix this problem by having the 1 pip greater than the rest of them. Almost twice as big, which ^3 makes it balanced against the 6 pips on the opposite side.
I have seen dice that try to partially fix this problem by having the 1 pip greater than the rest of them. Almost twice as big, which ^3 makes it balanced against the 6 pips on the opposite side.