Niles MP6R 6.5" 2-Way 75W In-Wall Loudspeaker (pair) Includes Speakers, Frames, Grilles and Brackets 6-1/2" Talc-filled polypropylene cone is light, strong and well damped to accommodate all program material Treated foam cone surround increases sensitivity and provides exceptional durability Proprietary tweeter-adjustment mechanism ratchets in 1mm increments and then pivots for precise aiming of high frequencies 3/4" Kaladex  dome with fluid-cooling and ultra-wide dispersion for clear and detailed high-frequencies