Upgrade your car audio system with the BOSS NX524 5.25-Inch 300-Watt and 6.5-Inch 400-Watt 4-Way Car Audio Coaxial Speaker Set. This bundle includes (2) 5.25-inch speakers and (2) 6.5-inch speakers to fully replace and enhance your current car audio setup. These 4-way, full-range speakers have expert power handling at 300 watts max and 150-watt RMS for the 5.25-inch size and 400 watts max and 200-watt RMS for the 6.5-inch size. The 5.25-inch speaker frequency response is 85 HZ to 20kHz with a 90 dB sensitivity. The 6.5-inch speaker frequency response is 65 HZ to 20kHz with a 90 dB sensitivity. Including optional metal mesh grills, you can protect the speakers from the elements, but if you are tight on space, you do not have to put them on. Each speaker is made with a poly injection woofer cone with a rubber surround and includes 2 tweeters and a 1.25 mylar cone midrange. Designed to easily fit into your car, both the 5.25-inch and 6.5-inch speakers work with a 2.25-inch mounting depth. The included installation hardware makes installation a snap. Enjoy higher quality playback in your vehicle with the 5.25-Inch 300-Watt and 6.5-Inch 400-Watt 4-Way Car Audio Coaxial Speakers from BOSS.