SpaceRail Game 32,000mm Rail, Roller Coaster Building Set, Marble Roller Coaster Kit with Steel Balls, Great Educational Toy for Boys and Girls, Level 7 Marble roller coaster track with three helix elevators to carry SpaceRail marble to the top Includes multiple different tracks for the marbles to travel, ten consecutive loops, drop-through steps, and vertical corkscrew drops Estimated build time: 9-12 hours Contains: 32,000 mm track line, Two steel .5 in marbles, Screw Conveyor Elevators, Arms and holders to place SpaceRail track, Freestanding base to fit entire marble run, and English instruction manual Recommended for ages 15 and up