Small Colorful Marble Run: Fun and entertainment for your child. This marble run awakes the architect in your child because many different construction variations can be built. Many different building blocks like wheels, cones, and turn elements make this marble run so enjoyable und guarantee a lot of fun. It's a great gift for any occasion! The pieces of this 105 pcs marble run are smaller, and therefore, NOT compatible with our MB775, MB776 and MB778 models.