Now young builders can learn to build with gears.. Gear up. contains 96 durable plastic and EVA Foam pieces and includes 4 different sized gears. A 35 page illustrated building guide helps with step-by-step instruction for building 4 cool models—a Crocodile that snaps his jaws, a Robot that moves his arms, a Heli Trike and a Fishing pole—all that utilize gears. Gear up. can be used in conjunction with other Superstructs building system pieces and sets to design and build other great gear centric creations of your own design. It comes in a heavy duty handled box that is perfect to store all the pieces. For more ideas of what other models can be built from Gear Up., visit dbx.superstructs.com." Moderate" Difficulty Rating For ages 4 years +