Polk Audio DB402 DB+ Series 4" Coaxial Speakers with Marine Certification, Black High performance audio upgrade that delivers signature quality sound that goes beyond OEM factory systems Marine certified with IP55 rating (water- and dirt-resistant) and tested for salt-fog, UV and humidity Polypropylene and UV tolerant cone with waterproof inner and outer surrounds Simple drop-in installation for any vehicle including cars, boats, ATVsyou name it Cut out Diameter - 4.09" Bottom Mount - 2" Top Mount - 1.79"