2 years & up. Combine basic math concepts and building play with these Giant Connecting Beads by Polydron. Great for hours of indoor and outdoor play, these giant square beads feature numbers 1-20 on one side and easily join together. Use them to teach counting forwards and backwards, for basic addition and subtraction problems, and more. The learning possibilities are endless! Made from durable, non-toxic plastic. Size: 8" x 8". Included: 10 Multicolor, connecting beads.