DB Drive K515D4 Okur K5 Series Subwoofer: * 2.5" aluminum voice coil * 4 layer DVC with aluminum former * VAC PP cone with rubber surround * Dish style VAC aluminum dome * 102 oz Y30 magnet * Stamped steel frame * Black electro-plated finished plate and yoke * Mixed spider * Spring terminals * PVC trim ring/gasket * Size: 15"