Wobble balls were used in the training of Jedi. Repulsors could levitate them off the floor, and during a sparring match a Jedi could use the Force to pluck it out of the air, and hurl it at someone. This would teach a Jedi to be more focused, and to avoid distractions during combat. A wobble ball was heavy enough to knock a grown man down when thrown with the Force. Wobble balls were able to be cut in half with a lightsaber.
- Legacy of the Force: Tempest (First appearance)