Ravensburger GraviTrax Kinetic Blast Marble Run Kids OS White Pre-Owned 159pc STEM - Item is pre-owned with minor wear present. Please see pictures for accurate description of item. If you have any questions, please let me know. - This GraviTrax Kinetic Blast set by Ravensburger is a comprehensive STEM-based marble run system featuring 159 pieces for endless track configurations. The set includes unique action elements like the Scoop and Transfer to propel marbles through a gravity-defying course. - Keywords: STEM Toy, Marble Run, Ravensburger, GraviTrax, Kinetic Blast, Building Set, Educational Toy, Physics Toy, Construction Toy, Engineering Kit, Creative Play, Modular Track, Gravity Game, Kids Activity, Gift Idea Colors may vary from screen to screen