Model no.: GS-5017System: 5" 2-way Coaxial car speakersWoofer: Injection-molded polypropylene coneMagnet: Ferrite 8 OzVoice coil:25 mm ASV Surround edge: RubberFre.Res.:65-22K HzSensitivity:88dB/W/mImpedance: 4 ohmsRMS power: 20 W