Solarbotics Solarbotics GraviTrack Marble Machine Kit

The Solarbotics GraviTrack Marble Machine Kit is part of the Marble-Drop mechanism family. Its swooping arms pass the marbles to each other to the top of a sweeping multi-level track. A switched battery pack smoothly exercises the mechanism. The smooth pick/hand-off/place motion is hypnotic and enchanting. No soldering is necessary. Solarbotics GraviTrack Marble Machine Kit; Battery powered wood marble machine with two swooping arms; Easy assembly (no soldering required); Comes with 4 marbles (batteries ...