Dear architects and builders of all ages, your help is needed to construct an all-new totally unbreakable marble run from Quercetti and Educational Toys Planet. The project is called Quercetti Transparent Marble Run. This marble run is unlike any other project you've worked on. That's because the construction toy set has transparent tubes, which allow you to track the progress of the real glass marbles through your roller coaster. Also, Quercetti Transparent Marble Run consists of flexible and elastic plastic, totally unbreakable parts! This marble run set includes 46 pieces, so you can build different designs of coasters. The parts of the building kit include wheels, tubes, bridges, and sturdy base pieces. Real quality marbles come with the construction set. The Quercetti Transparent Marble Run is an excellent sturdy building toy by the famous award-winning Italian toy maker.