This is an awesome GraviTrax interactive marble run set by Ravensburger. This is the ultimate STEM building toy that teaches gravity, kinetics, and magnetism. This set is open-box and has been meticulously inventoried so you know exactly what you are receiving. It is a mix of the core Starter Set components plus extra tracks and the Trampoline Expansion elements! What's Included: Base & Structures: 4 Cardboard Base Plates, 2 Clear Transparent Levels Height Tiles: 40 Large Black Height Tiles, 10 Small Black Height Tiles Tracks & Rails: 21 Assorted Silver Plastic Tracks (3 extra compared to the standard base set!) Standard Junctions & Tiles: 21 Curves, 3 Junctions, 1 Switch, 1 3-in-1 Block, 1 2-in-1 Block, 4 Basic Tiles & Inserts Action & Special Pieces: 1 Launch Pad, 1 Magnetic Cannon, 1 Vortex, 1 Free Fall, 1 Splash, 2 Catchers, 1 Finish Line Marbles: 4 Metal Marbles Manuals: Original Construction Plan Booklets & Track A Guide BONUS ADD-ON INCLUDED: 2 GraviTrax Trampoline pieces with angled inserts! Condition Notes: The set is clean and in excellent, gently used condition. Please note a few minor part count differences from a stock retail box: it includes 4 marbles (instead of 6), 10 small height tiles (instead of 12), is missing the small green landing plastic insert, but features 3 extra track rails and the complete Trampoline expansion pack components. The original box is included but shows some wear and has black tape on the edges from storage (see photos).