DB DRIVE K915D4 Okur Series Subwoofer (15-Inch; Dual 4) Non-Transfer Paper Cone with Rubber Surround Dish Style Vac Aluminum Dome 165 oz. Ferrite Magnet Black Electro-plated Top and Bottom Plates Die Cast Aluminum Frame 3-Inch voice coil 4 layer DVC with aluminum former Non transfer paper cone with NBR rubber surround Dish style vac aluminum dome with laser etched logo 165 oz Y30 magnet