Experience the power of gravity! GraviTrax is the all new marble run track system from Ravensburger! The GraviTrax Hammer will add some much-needed velocity to your track layout. If the gravity spheres have slowed to a crawl this Hammer will smack the sphere giving it some much needed momentum to complete the circuit! Use your imagination to build superb tracks and set the gravity spheres rolling! Contains: 1x Set of Instructions, 1x Hammer Tile, 1x Long Track, 2x Medium Tracks, 3x Short Tracks Total Pieces: 7 Suitable for ages 8+