Little Treasures Space Rail Marble Roller Coaster Kit with Steel Balls Space-track space-jet level one includes, 8600mm of rail and 12 steel balls included in this great set- requires batteries and batteries not included This level set features paths for your marble to travel on including loops hills and turns a conveyor and drops Whether you're a first-time space rail or veteran from the days of space warp, explore the various levels of space rail's marble roller coasters Space-track is line of do it yourself marble roller coasters that you can assemble and have fun building, including cutting tracks to correct size Once our science education toy is assembled and enjoy hours of rolling metal ball entertainment