The set of gaskets is made from special high-temp silicone rubber just for this application. It does replace the silicone sealer you would normally use. The gasket is reuseable. Hope this helps. There is a picture of a T-56 set on my website if you want to see what the material looks like. The Mach 1 (TR-3650) gasket set is different of course.
http://www.cobrabob.com/