HELP Can't remember the name of a product

Years ago I bought a thin mylar type black disc that you placed on a CD or DVD and placed in the tray. This disc would clamp to the CD when playing. It was supposed to make a big difference in sound quality etc. I need it for a BluRay player that seems to have problems reading thinner transparently labeled discs. I see one called Millenium Carbon Fibre at 120.00 but that is way more than I need to spend. The disc to which I refer came in a cardboard digi-pak and I think it was Aurex or something like that. It really was just a black disc of mylar when it comes down to it, I am sure. Anyone remember these or know where I can purchase one of these. Thanks in advance.