See the following URL for a list of their track parts.
All pieces are accurate in terms of size, curvature etc.
Obviously you can use any car on the track with a bit of modification to look more like a slot car. I have included a couple of cars I picked up on here, for free (i.e. they were designed by someone else, but I have stuck them in here at no extra cost, just to save you time). I have also edited them to look more like scalextric cars, with a more plastic look, blacked out windows, removed the interior etc.
This is the original designer, so please give him credit for the car.
Any other questions, please feel free to contact me.