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Convert your battery powered Gravitrack into a solar version using this kit!
Our GraviTrack Marble Machine Kit is our newest addition to the Marble-Drop mechanism family.
Convert your battery powered Marble Machine into a solar version using this kit!
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Warning: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Please visit www.P65Warnings.ca.gov for more information. This item was manufactured prior to August 31, 2018.