Copper Voice Coil On Polyimide Former For High Power Handling</br>Ferrite Magnet And Vented Pole Piece</br>Stamped Steel Frame</br></br>Product Description</br></br>High SPL Car Audio Mid/Bass Driver. Can be used in small enclosures or in free air ( doors?? open baffles?? deck lids )  Nominal Basket Diameter:Diameter 6.5 in.?? 165.1mm Nominal Impedance: 8 ohms  Power Rating: 100 W   Peak Watts:  400 W Resonance:119 Hz  Usable Frequency Range: 100 Hz-5.3 kHz Sensitivity: 93.4   Magnet Weight: 20 oz  Gap Height:  0.24 in.?? 6.1 mm Voice Coil: 1.5 in.?? 38.1 mm  Mounting Holes Diameter: 5.59-in Copper voice coil  Polyimide former Ferrite magnet  Vented core Pressed steel basket  Treated Paper Cone  Sealed Cloth cone edge Treated paper dust cap</br><br/>http://www.amazon.com/gp/product/B005D7FH9O