300mm, 12 Free air Subwoofer with High Power handling 500 watts RMS and 2300 watts Max.Power Double voice coil, with extremely long excursion, 4 layers, black Aluminum Impedance 2x2 ohms High efficiency (95 dB) Spun Paper Cone Surround made of black rubber 62.3 oz and 1760g ferrite magnet Steel basket Push terminals (surface: nickel) Air ventilation via basket and magnet Blaupunkt logo printed on the dust cap Speaker cover included GT Dark Edition design Perfect price and ratio performance.