ALEX Toys Big Stack Cardboard Blocks is the perfect toy to build it BIG! Let your child build away with the 40 light-in-weight, yet sturdy blocks included in this set. You can even stand on them; they hold up to 120 pounds. The blocks are printed with different patterns on each side so you can design different looks. This block set includes 24 small (6in. x 3in. x 3in.), 8 medium (6in. x 6in. x3in.) and 8 large (3in. x 6in. x 12in.) cardboard blocks. Adult assembly is required to fold the cardboard into blocks. Recommended for children 3 years of age and older.