You shoot, you score! Introducing the VEX Robotics Hook Shot Ball Machine by HEXBUG - a kinetic art mechanism that blends the intrigue of sophisticated machinery with the excitement of sports science. Spin the hand crank to wind up the elastic powered striker arm to launch balls through the loop system and sink them in the return basket. This construction kit challenges you to not only Build Genius, but dos so while constructing a roller coaster style ball machine at the same time. Once built, watch as the gears turn, the axles twist and the balls roll as you turn the knob by hand or attach a motor kit to add power to this machine!