The Gravitrax Expansion Flip Ravensburger Interactive Track System is a STEM-themed marble run set released in 2019 by Ravensburger. This set, part of the GraviTrax product line, allows builders to create their own tracks and designs using plastic materials. With an age level of 8+, it offers a creative and interactive experience for children and adults alike. Some wear to plastic cover as noted with photos.
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