Both sturdy and easy to build, 127 piece Bamboo Musical Marble Run features hand-crafted carbonized tracks. Colorful bamboo cylinders. A sustainable wood spiral. Four tracks with built-in chimes that make music as the marbles roll across. And 30 marbles. Rope rings prevent marbles from rolling across the floor. Instruction booklet not only identifies building components and their functions. It also shows how different parts fit together to build a marble run. Once you learn the basics, the possibilities are endless.