Wooden spiral coaster craft kitWooden spiral coaster craft kit No tools required! Make a full fledged spiral coaster! You can make a coaster in which an iron ball keeps rolling down a spiral course. When you turn the handle, the iron ball on the rotating part rises, and when it reaches the top, it goes through a hole and goes down the spiral path and returns to the bottom. The parts are laser cut, so you can assemble it immediately without tools! Assembly time: Approximately 40