The CS Series delivers remarkable performance and ultra-clean bass, utilizing a heavy-duty motor/magnet structure featuring EVC (Extended Voice Coil) technology not found in stock speakers. They use polypropylene cones with tough, ribbed, UV-treated surrounds for precise linear excursion and reliability.The CS 6-1/2-inch component speakers are an outstanding factory upgrade. The components include titanium tweeters and polypropylene woofers with EVC technology, for a customized sound and the best sonic quality.Geek Squad® Installation RecommendedVisit your local Best Buy store for more information.