Hammer it home! Propel the marble through your run by adding the Hammer. When triggered, the hammer swings down and hits the marble, giving it momentum to send it on its way. This accessory also includes 6 additional tracks. GraviTrax Starter-Set required Contents: 1x Set of Instructions, 1x Hammer Tile, 1x Long Track, 2x Medium Tracks, 3x Short Tracks Total Pieces: 7