These multi-faceted dice are perfect for introducing number order, addition, subtraction, greater-than and less-than concepts, probability and more. The set includes dice with 4, 8, 10, 12 and 20 sides, in an extra-large 3-inch size, with soft foam construction that's quiet for classroom use. Includes an activity guide. Size: 28.2 x 21.3 x 9.7 cm. Ages 6+.