Send one of the ball bearings rolling.
- another ball bearing is launched like a rocket up the slope, around the curve, and back around to start the action all over again! Science & Nature. With a SNAP, it collides with a magnet and - WHOOSH! Building & Construction. Geomag Mechanics Gravity Race Track - 67 pc - Building & Construction for Ages 8 to 9 - Fat Brain Toys Toys.Magnets & Magnetism.