"The Crank" is a hand powered version of our flagship Marblelous Wooden Spiral. How's it work? Simply turn the crank and watch the marbles climb the spiral elevator. Once they reach the top of the elevator, watch the marbles race down the spiral slide. Each toy is made by hand and therefore unique in wood grain, color and characteristics. Dimensions: 7" W, 2 1/2" D, 16" H Ships with 16 marbles that are self contained within the toy. Another great gift idea for the desktop or children.