Polk Audio DB651s Slim-Mount 6.5-Inch Coaxial Speakers - 2 pairs (4 speakers) 2 pairs, 4 speakers of the Polk DB651S - marine certified speakers perfect for use in cars or boats of all types Equipped with a 0.75-inch liquid-cooled silk-polymer composite dome tweeter; Maximum input power: 165 watts Equipped with a dynamic balance polymer/mica composite mineral-filled cone for a big sound Durable butyl rubber surround stands up to the stress of extreme temperatures, sunlight and time