The first sectional slot tracks from Scalextric and VIP were molded rubber and folded metal, respectively, but modern slot tracks fall into two main categories: plastic tracks and routed tracks.
Routed tracks have the entire racecourse made from one or a few pieces of sheet material (traditionally chipboard or MDF, but sometimes polymer materials) with the guide-slots and the grooves for the power strips cut directly into the base material using a router or CNC machining.