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Published on Jan 21, 2008
Linear Rails = solid copper rod 24" long x 3/16" diameter. Wooden Base = MDF. Rare-Earth Magnets = ( 8-off ) 1/2" dia. x 1/8" Thk. Batteries = ( 2-off ) AA Note....The batteries will overheat if left on the rails for too long and may explode, so please remove them after each demo and let it cool down. Playing safe is a good thing..