They are Tamiya LEO 2A6 tracks. They are the same tracks that would come with the LEO. The sprockets are also from the LEO, that is what the machined shaft adapter is for. LEO sprockets wont work on standard gearbox shafts so I came up with this idea. I got the tracks and sprockets from Karen at the AAF Museum. The tracks where 60.00 bucks I think I remember paying. Not too bad of a price, and they are great tracks . Real rubber pads.