Quantum QB65C Beta Series 6.5-Inch Component Speaker 6.5-Inch Component Speaker, Piezzo Dome Tweeter Mylar Dome Tweeter / Mid, PP Cone Ferric Oxide Magnet, Rubber Surround, Stamped Heavy Gauge Basket. Speaker structure: 6.5, max power: 200 Watts RMS power: 80 Watts, sensitivity: 92dB freq. response: 40Hz - 25KHz , magnet size: 15 oz Ferric Oxide Magnet