Solarbotics GraviTrack Solar Marble Machine Kit (Solderless Version)

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Solarbotics GraviTrack Solar Marble Machine Kit Solar powered - No batteries required Includes a GM3 Motor Doesn't require soldering Build time: 2 hours Ages: 14+ The Solarbotics G raviTrack Solar Marble Machine Kit (Solderless Version) brings the same tick-tock pulse movement but with none of the molten metal. It is solar-powered. The only tools required to get this beauty running are a Phillips-head screwdriver, a sharp edge, and a bit of elbow grease. Show more