Amish-made Wooden marble roller machine toy, child-safe maple/walnut finishTry this Marble Machine and see the wonder of a simple machine at work. You line up the included marbles on the top track and tap the lever to get it started. The force of the the empty lever coming back up will release the next marble and on it goes until you run out of marbles. It is almost like Perpetual Energy! This is a wonderful educational tool to teach youngsters about Laws of Motion and Physics. Kids love to learn Hands On with these toys.