DS18 10? Woofer, 220W RMS/440W Max, Single 4 Ohm Voice Coil 440 Watts Max 220 Watts RMS Mounting Depth: 4-1/2? Frequency Response: 40 Hz - 4.5KHz 2" Single 4 Ohm Voice Coil Black Aluminum Voice Coil Sensitivity: 88 dB 45 oz. Ferrite Magnet Stamped Steel Frame Paper with Glass Fiber Cone Foam Edge Surround Sold Individually