3 years & up. Use this unique Colorful Dice in Dice Set for Games with Container for Easy Storage for a variety of engaging classroom learning activities. These dice each have a smaller dice inside for added sensory play. This set promotes early math skills, collaborative learning, color recognition, and fine motor skills. For a fun activity, have your children roll two dice and add together the number of dots on the dice inside and outside. Set of 72 dice. Measures .75" cube.