Polk Audio DB401 4-Inch Pair Coaxial Speakers - Silver Durable butyl rubber surround stands up to the stress of extreme temperatures, sunlight and time Equipped with a dynamic balance polymer/mica composite mineral-filled cone for a big sound Equipped with a 0.75-inch liquid-cooled silk-polymer composite dome tweeter and a neodymium magnet Pair of marine certified speakers perfect for use in boats of all types Maximum input power: 135 watts The item is non-returnable Pair of marine certified speakers perfect for use in boats of all types Equipped with a 0.75-inch liquid-cooled silk-polymer composite dome tweeter and a neodymium magnet Maximum input power: 135 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