Marble Roller Coaster - Thread Boards Add-on (V02)
$42.00
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Build video: https://youtu.be/yZ1yktTmjrE *Warning* this is a very difficult build that requires glue and/or plastic welding Requires: 3/4" steel ball bearings <8mm x 8mm x 7mm magnets *not intended for children - choking hazards*
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