For round barrels / exhausts suitable for TS1, RB, Monza, Imola kits. 
These are also handy for people who have opened up their exhaust ports/exhausts, so you can file them, dremel them to match them up perfectly with your barrel and exhaust without going through the thin veneer of copper on standard copper gaskets.
With them being solid copper they crush up well against uneven surfaces, but you must anneal the gasket before fitting to soften them and also make sure the exhaust flange is flat, it's surprising how many aren't!
U.K. made
 
Price includes VAT @ 20%