This ingenious wooden marble run system from Bajo can be enjoyed by all the family. Connect the wooden dowels with the rings to make three posts and four track runs in a triangle formation. Adjust the gradient for varying speeds and heights. The wooden dowels that make the track are held in place by oval shaped rings which when twisted lock the track in place. This is a tricky procedure that will require adult help at first. After some practice children will be able to lock the pieces together by themselves fine tuning the position and making their own runs. Once complete children just love to roll marble after marble down the track. Young children will simply enjoy playing with the run while older children will enjoy the challenge of construction.