[. . . ] [. . . ] · · · · The cone uses a mixture of cut and milled fibers that are made from aromatic polyamide. It is then impregnated with resins to simultaneously achieve high rigidity and optimum damping. The cone has an olefin film thermally adhered to its surface to control frequency response and to establish long-term reliability. The center dust cap is made of non-wood cellulose material and is also impregnated with resin. [. . . ] [. . . ]