Product DescriptionSend 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 ExpansionSet of 40 additional elements to extend your GraviTrax marble runIncludes 16 large vertical tiles, 8 small vertical tiles, 7 curve tiles, junction tile, long track, 2 medium tracks, 3 short tracks, 6 marblesRequires GraviTrax Starter Set – Sold separatelyHigh quality materials and construction – Lasting durability