These KFC-1396PS 5-1/4" speakers rock a polypropylene cone with a diamond array pattern, which minimizes distortion, while a rubber surround ensures overall durability. All the musical details are handled by the balanced dome tweeter, and dispersion is improved by Kenwood's proprietary Sound Field Enhancer. Kenwood's Acoustic Sound Harmonizer uses slots on the mount housing the tweeter to improve the transition to the higher frequencies, so you'll experience a smoother sound overall. Grilles are included for custom installations.