Your child will have fun creating and sending marbles down the wooden 99-piece Quadrilla Twist & Rail Set. Curved rails, straight rails, and a big twist make up this set with many hours of excitement. Fifty marbles are included in a cloth bag for safe storage. The Twist & Rail Set is the most popular of the Quadrilla sets. The Twist and Rail Set will surely stimulate the budding builder. There’s fun for the whole family in every Quadrilla Twist and Rail Set. Assembly required. See also the new Parents® Jungle Pals Zebra™ that is an innovative stand up puzzle.