Kicker CompR 8" 4-Ohm Subwoofer Double stacked magnet provides powerful bass and a thunderous low-end response for the thump you crave UniPlate back plate and pole piece serve as one solid unit providing excellent thermal management Signature red double stitching insures a long lasting bond between the Santoprene surround and an all-polypropylene woofer cone Polypropylene SoloKon cone system with 360-degree bracing delivers musical accuracy and reliable everyday performance Two sets of lustrous satin nickel covered brass spring-loaded voice coil terminals for versatility and optimal signal transfer