Use your imagination and creativity to build the most beautiful and best marble run. Finished building? Then it's time to test it out. Pay close attention to whether all your marbles go down the right path in one go. This will give you hours of building and marble-playing fun. Made of sustainable wood, and the paint and varnish are child-friendly. Contents: 6 marbles, 21 colored building blocks in various sizes with different colorful prints, and 26 marble run blocks in various sizes.