Koplow Games 10-sided double dice each feature 10 sided-dice and has another 10-sided die inside. The clear outer die makes it easier to see the inner die. Dice helps to understand basic math functions, practice basic math functions, create percentages, and enhance games and activities. Ideal for ages 6 - 11 and grades 3 and above. Warning: Choking hazard, small parts, not for children under 3 years. Details:Assorted translucent colors 1.25"6 pack (6 dice per pack, 36 double dice total)Smaller opaque die inside PlasticFor grades 3+