Selenium 8MB4P 8" Woofer / Midbass Speaker Long fiber pulp cone and impregnated half-roll fabric surround for smooth response Strong cast aluminum frame with epoxy coating Low mass aluminum wire voice coil on polyimide former Massive 45 oz. magnet provides high motor strength Useable response from 80 to 5,000 Hz, flat from 160 to 1,600 Hz