Hertz MP 70.3 Pro 100W Max 4-Ohm 3" Car Audio Component Midrange Speakers Size mm (in.) 70 (3) Power Handling - Peak W 100 (Hi-Pass filtered @250Hz - 12 dB Oct.) Impedance  4 | Frequency response Hz 180  18k | Sensitivity dB SPL 88 Voice coil  mm (in.) 20 (0.8) Magnet Neodymium | Cone/Dome Pressed-pulp cone with cotton fibers Comes with Grills