Experience the power of Gravity! GraviTrax is the all new marble run track system from Ravensburger! Use your imagination to build superb tracks and set the gravity spheres rolling! The GraviTrax Loop with add another element of fun to your layout. You will need to figure out how much momentum the gravity sphere needs to make it around the loop. Contains: Instructions (D, F, EN, NL, E), 1 Loop Tile, 1 Long Track, 2 Medium Tracks, 3 Short Tracks Suitable for ages 8+