Thunder Marine separate speakers are designed to withstand almost anything Mother Nature can throw at them. Featuring weather resistant polypropylene cones and teteron tweeters these speakers are extremely mositure resistant. Each speaker utilizes a sealed PVC basket to ensure moisture is kept out of the motor structure and an ASA plastic grille that is both impact and UV resistant. All hardware is either stainless steel or gold plated to protect against corrosion and maximize performance. Thunder Marine speakers can be utilized in application where weather resistance is important and the best part is you don't have to sacrifice sound as these speakers deliver true MTX performance.