The DS 3-1/2-Inch Coaxial Speakers are an excellent factory upgrade. These coaxial speakers are a significant upgrade in your sound. A stamped steel framework supports a ribbed, UV-treated foam surround and rigid polypropylene cone with EVC (Extended Voice Coil) technology, for the best sonic quality. Using zero protrusion PEI tweeters ensures you get every bit of clarity you need, without interfering with factory grilles. These DS speakers work best with 20 watts of recommended power.