Marine Grade And Functions: The speakers with high Marine grade of IP66 also have Anti-Salt, fog, UV Protection, high temperature resistant functions. The overall spray hull dedicated coating , the whole unit sealed, and it can also play great soundquality in harsh enviroment . Special Materials: The Herdio HMS5104W Speakers are designed for universal vehicles and Boats. The Materials we use as polypropylene cone can accurately reproduces sound, and the molded ABS plastic basket keeps your sound distortion-free. Concise Design and Best Sound Quality: Built in high definition digital stereo effect, to ensure syllable clear ,into a sense of strong ,sample appearance design,but bass shocking you. Compact And Powerful: The Speakers is compact in size, the Maximum Power Handling is 160 watts a pair , Frequency response 100Hz-18KHz. Tiny size for easy installation: The 4” marine Flush mounted speakers comes with Mounting Screws and bolts allows you easily install them into a place where limited space available only. Product Dimensions 4.88"(124mm) (W) x 3.8"(96.5mm) (H) x1.37"(35mm) (D) Idea for : Boats, Yacht, Gauge, Fishing Boats, Pontoon, Motorcycles, Motorbikes, Cars, ATV, UTV, SUV, RV, Golf Carts. SPA Rooms, Swimming Pools ,Campers, Cubby Cabins, RZR, Harvesters, Excavators, Jet Skis, Hot tubTruck.