Speakers: Fits nearly every car made Zero-protrusion tweeters to fit nearly any factory depth Woofer EVC (Extended Voice Coil) tech assists with precise linear excursion UV-treated poly-foam surround resists heat or direct sunlight Large woofer magnet in a heavy-duty motor for ultra-clean bass PEI-tweeter construction provides superb clarity Neodymium tweeter magnets allow for increased volume in high frequencies Steel mesh grilles included for speaker protection Speaker Design: 2-way Woofer Size [ in, mm ]: 4, 100 Tweeter Size [ in, mm ]: 1/2, 13 DC Resistance [ ohm ]: 3.5 Peak Power [ watts, per ANSI/CTA-2031-A ]: 150 Recommended Amplifier Power [ watts RMS ]: 50 Sensitivity - SPLo [ dB @ 1W, 1m ]: 88 Effective Frequency Range [ Hz ]: 60-20k Mounting Hole Diameter [ in, mm ]: 3 3/4, 95 Top Mount Depth [ in, mm ]: 1 13/16, 46 Bottom Mount Depth [ in, mm ]: 2 1/16, 52 Tweeter Protrusion [ in, mm ]: 0 Tweeter Magnet Material: Neodymium Tweeter Dome Materia: PEI [polyether imide] Tweeter Design: Balanced dome Woofer Cone Material: Polypropylene Woofer Surround Material: Polyester foam