Soft rubber Tyre walls are needed on every track. They will save your cars. I bought mine from Slot Track Scenics. They are black. There are sets with covers as well. However I painted them in white and red. Its pretty straight forward. Since they are made of soft rubber you need to use som sort of primer. I have used DUPLI-COLOR Plastic Primer, but other primers för plastic will do great as well. I spray half of the Tyre walls white and the other half red. I finish them off with a matt varnish. I have used permanent spray from Edding, but again any permanent spray will do, I guess.