Assemble the 236 laser-cut wooden pieces to create a seriously impressive roller coaster. With a crank of the handle, fire up the gears and watch as the waterwheel coaster carries the marbles up to the top and then releases them down the track. This mechanical marble run is a great toy that provides hours of fun while also exploring gravity, engineering, physics and more. Punch the precisely cut pieces from the high-quality plywood sheets for easy assembly. Assembled size is 10"L x 9"W x 6 1/2"H. Ages 14 yrs. to adult.