Learning Advantage Polyhedra Dice - 12 Sides - Set Of 12 - Hands-On Math Manipulative - Teach Numeracy - Math Games For KidsProbability and math activities come alive when using these specially configured, alternative dice! Each set contains 12 dice. Practice early numeric concepts or break them out while playing Dungeons and Dragons! Use these 12 sided, multipurpose dice to organize grade appropriate math activities and explore number concepts, operations, probability, statistics, pre algebra and more. For ages 3+ Size: 1. 3'' W.