Huh, well, since bondagecard is basically the same in the OVA,Manga, and OA... will these refs from the OA help?
I dunno if you have this issue sorted out by now or not, since this thread is about a week old... but I hope that may have helped.
As for the material... Like everyone else said: pleather.
Vinyl is just a big shiny, squeeky, mess of insanity...
and shininess just makes things look kinda tacky most of the time.