TRACKPRO CONTOUR 2a is a revolutionary slot car track cleaning module that is pushed by a slot car to wipe dust and debris from the track surface, conductors and slot. Now track cleaning is as easy as driving a slot car! In addition to track, conductor and slot cleaning, the slot car used for pushing the track cleaner will benefit from tire conditioning because the added forces from pushing, help remove dry rubber and other contaminants from the driven tires. These contaminants are deposited onto the track and removed on the following lap. You'll see performance improvements in your track and cars, guaranteed! This is our second model that has been improved.