Ultramarine 7.7" Coaxial Speakers - BlackThe Polk UMS77W speaker uses air suspension technology to deliver 200 watts of power in a sleek, waterproof and UV/corrosion resistant package, perfect for life on the water.Features:. Black housing and grille. Air Suspension Design. Cast Aluminum Basket. High Temp Voice coil. XKGlow LED Light Ring (Compatible with XKGlow Controller w/ App Support). White Grille, Bridge, and Trim Ring. Snap On Grille Installation Option. Silver Cone. Insulated Tinsel Leads. Sold in pairs. Brochure (pdf)