This Positive Negative Foam Dice 22mm 12 piece set is the perfect educational tool for teaching kids about mathematics and probabilities. The set includes six-sided dice with faces displaying +1, +3, +5, -2, -4, and -6, while the other six dice have faces showing -1, -3, -5, +2, +4, and +6. Made from EVA foam, these soft and lightweight dice make less noise and are perfect for teaching and learning.