Cubes that keep you guessing and rails that go the distance really ramp up your marble run fun! The unique design of Q-BA-MAZE cubes allow for a limitless range of configuration options. The 7.5-inch straight-away rails connect easily to any cube or to each other to create tracks that send your marbles zigzagging through the maze of colorful cubes. Plus, the precision engineering of the double-exit cubes gets everyone wondering, "Which way will the marbles go?"Details:Includes assorted colors138 piecesCompatible with all Q-Ba-Maze 2.0 setsRails extreme set adds more straight-away to your already exciting setAges 6+ yearsContents:36 single-exit cubes18 double-exit cubes8 L-exit tubes18 bottom-exit cubes2 quad-exit cubes18 straight-away rails4 coaster tubes4 marble catchers30 steel marbles