Koplow Games Jumbo polyhedral dice game is effective method of developing math reasoning and computation skills. Aid in teaching addition, subtraction, multiplication, division, fractions and percentages. Each set includes (1) 4-sided, 6-sided, 8-sided, 12-sided, and 20-sided die, and (2) 10-sided dice in assorted colors. Warning choking hazard: Small parts, not for children under 3 years.