5x7-Inch 180 Watts Coaxial Speaker System with additional voice coil ventilation for increased power handling and EXP pole core technology for maximum excursion and lower harmonic distortion. General: Cone Material: Injected PP. Surround: Rubber Tweeter: PEI Neodymium Magnet Frequency Response: 60-22,000 Hz. Sensitivity: 91dB. Mounting Depth: 55mm. Diameter: 180mm x 126mm. Impedance: 4 Ohms Designer grilles