From the Manufacturer It"s a new twist on a favorite toy--why stack with just pegs when you can add colorful monkey pegs to the mix? Kids will enjoy using their imagination to create their own Mighty Monkey formations and seeing how high they can stack the 2 2/8" monkeys. Each monkey"s leg acts as a peg and can be used with all Lauri Tall-Stacker pegboards and pegs. Includes Lauri crepe rubber pegboard with 36 holes. The Activity Guide suggests several exercises to get started. Product Description It"s a new twist on a favorite toy - why stack with just pegs when you can add colorful monkey pegs to the mix? Kids will enjoy using their imagination to create their own Mighty Monkey formations and seeing how high they can stack the 2 5/8" monkeys! Each monkey"s leg acts as a peg and can be used with all Lauri® Tall-StackerTM pegboards and pegs.