I think they're called flexi discs. http://www.npr.org/2015/04/18/400369975/its-thin-its-plastic-its-back-flexi-discs-find-new-fans http://www.npr.org/2015/04/

I think they're called flexi discs. http://www.npr.org/2015/04/18/400369975/its-thin-its-plastic-its-back-flexi-discs-find-new-fans http://www.npr.org/2015/04/18/400369975/its-thin-its-plastic...