12 inch speaker very high quality with Ceramic magnet CLICK HERE FOR A SOUNS SAMPLE Nominal Overall Diameter: 306 mm/ 12 inch Musical Power (DIN 45500): 50 Watt Resonance Frequency: 74 Hz Nominal Voice Coil Diameter: 25 mm/1 inch Magnet Weigth: 280 Gr/ 10 oz. Sensitivity @ 1 W, 1m: 93.8 dB