Fusion's Marine Speakers are designed and engineered from the ground up to incorporate state of the art audio innovation never seen before in high performance marine speakers. Designed to withstand the harsh marine environment and comply with International ASTM Standards for UV Stability and Salt/Fog Resistance. Also complies with IP65 Waterproof and Dust Standards and features a fully sealed cross-over, magnet and tweeter housing with waterproof cone and surrounds. All of Fusion's Marine Speakers are tested extensively, both in terms of how they sound and whether they will withstand unique marine conditions without deteriorating. Rugged marine grills provide strength and rigidity in high-traffic areas, or where objects are likely to be moving around or knocking into speakers. The central core titanium tweeter stabilizes the speaker grille, while protecting the high pass crossover components from the elements. The 4" Marine Speakers come complete with Ice White Grilles. Also come in 7" and 6" sizes (MS-FR7021, MS-FR6021)..