Kicker Speaker Bundle - Two pairs of Kicker 4x6 Inch KS-Series Speakers 41KSC464 Two Pairs of Kicker 41KSC464 4x6" 150 Watts Peak / 75 Watts RMS 2-Way Coaxial Car Speakers Woofer Composition Polypropylene Sensitivity 88 dB Frequency Response 50 - 20000 Hz