Time for some fun in the sun with the KnuckleStrutz ® Dune Racer™ construction set! When it comes to kicking up dirt in the desert, the Dune Racer ™ really leaves its competition in the dust. With this building kit you can also make the Knuckle Copter™ , a high flyin' helicopter with spinning main rotary and tail blades, and the Street Racer™, a sleek, lean racing machine that's ready to hit the streets.