Product Description Send your GraviTrax marble run sprawling into endless fascination! GraviTrax is a unique marble-run system featuring hexagonal risers and track tiles that simply fit and stack together, rail-tracks that hook into place, and stunt pieces that add exhilarating twists and turns. And with this expansion pack - Those twist and turns become more abundant and more long-lasting! Build taller, build further, and let your creativity run freer with the GraviTrax Trax Expansion pack. GraviTrax - Trax Expansion Set of 40 additional elements to extend your GraviTrax marble run Includes 16 large vertical tiles, 8 small vertical tiles, 7 curve tiles, junction tile, long track, 2 medium tracks, 3 short tracks, 6 marbles Requires GraviTrax Starter Set - Sold separately High quality materials and construction - Lasting durability