Hertz MP 25.3 120W Max 4-Ohm 1" Car Audio Component Tweeters Size mm (in.): 29 (1.14) | Power Handling: Peak W 120 (Hi-Pass filtered @ 2,5kHz - 12 dB Oct.) | Impedance : 4 | Frequency response Hz 1.4k  22.5k Sensitivity dB SPL: 91 | Voice coil  mm (in.) 25 (1) | Magnet: Neodymium | Cone/Dome: Tetolon 1. Tetolon fiber soft dome, for a natural yet detailed reproduction of musical nuances. | 2. Center Tuning Duct geometry, for lower resonance frequency and reduced harmonic distortion. 3. High density flux Neodymium magnet, optimized for utmost control during high energy dynamic transients in the mid-high frequency range. | 4. 25mm ferrofluid-cooled mobile voice coil. 5. Rear chamber filled with selected damping material and sized for lower Fs, to ensure a well damped high pass frequency roll-off, allowing low cut-off frequency crossover point. | 6. Faceplate featuring FEM (Finite Element Modeling) optimized geometry, for high linearity in off-axis installations. | 7. Wide array of installation accessories, for an easy OEM integration.