These rear  PU tyres are made to fit the Scalextric:-
 
New Metro 6R4/RS200 (and many others using the same tyre).
Peugeot 205 T16 (and many others using the same tyre).
Classic Ford Capri (and many others using the same tyre).
 
These tyres have been made with a little more ground clearance and no tread, so giving better performance, but they may need sanding on a tyre truer to clear the wheel arches of some cars.
 
Sold as a pair.