Grime Dice Juggling Balls

Grime Dice are a set of five dice with the numbers arranged so that you can always choose a dice that will, over time, beat the dice chosen by your opponent. They are known as non-transitive dice.

You can make these as juggling balls or stuff them with something more rigid to maintain the cube shape. 

For more information, and a video demonstrating the mathematical properties go to http://www.woollythoughts.com/grimedice.html