Model no.: GS-4645System: 4"X6" 2-way Coaxial car speakersWoofer: Injection-molded polypropylene coneMagnet: Ferrite 8 Oz Y30Voice coil:25 mm KSV Surround edge: RubberFre.Res.:60-20K HzSensitivity:91 dB/W/mImpedance: 4 ohmsRMS power: 25 W