Time for some fun in the sun with the KnuckleStrutz ? Dune Racer?! When it comes to kicking up dirt in the desert the Dune Racer? really leaves its competition in the dust. With this kit you can also make the Knuckle Copter? a high flying helicopter with spinning main rotary and tail blades and the Street Racer? a sleek lean racing machine that?s ready to hit the streets. Includes 74 pieces and 4 gears with tires.