Grimm's | Assembly Ball RunGrimm's Assembly Ball Run With the ball track kit you can build an individual, double run spiral track for marbles. The marble run can be built up by yourself and sorted by colour as you wish. Marble races can also be played with the resulting double track spiral track: For example, a wooden ball can compete against one of the included bells. Which one wins here? The Grimms wooden marbles also fit for even more marble fun. Contents: 80 colour assorted