Bamboo Marble Runs, interchangeable, non-toxic, eco-friendly. The 127 piece set includes chimes to make music! Build your own custom structure and watch the marbles roll, drop and race down the tracks and spirals. Or, open up the instruction book to find basic building concepts as well as tips and tricks to really get your marbles rolling! Each set includes 30 marbles and endless possibilities. A brilliant way to inspire creativity while developing a STEM foundation.