Kicker 07DS400 4-Inch 100mm Coax Speakers (Pair) 4-inch coaxial speaker with reduced mounting depth for easy upgrades in doors or kick panels Injection-molded polypropylene cone with UV-treated ribbed surround 25 Watts RMS (50 Watts peak) power handling with 4-ohm impedance 60 Hz-20kHz frequency response One-year limited warranty