These are dice which can be used anywhere a normal six-sided die is required. Each die is a sphere with the numbers 1 to 6 printed evenly on the surface. Inside, the die is hollow and contains a small ball bearing which falls into one of six pits. These pits are aligned with the numbers on the surface, so the weight of the ball bearing will cause one number to remain facing upwards.

Of course, the idea isn't limited to only six-sided dice. However, adding more "sides" makes construction of such a die much more complex.

Spherical dice have no particular advantage over regular dice, and take forever to stop wobbling.

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