Koplow Games double dice, a die inside of a die. Great for math games! Roll it and add, subtract, multiply or divide the numbers. A great way to practice basic math skills and enhance games and activities. Small parts, not for children under 3 years Details:Assorted translucent colorsSmaller opaque die inside3/4" (19mm)8 double dice per pack10 packs per bundle80 dice totalPlasticFor ages 5 and up