Featuring a water-resistant IMPP Composite Cone, the speaker produces outstanding mid-bass response and resists the effects of salt water, humidity and extreme heat. Each speaker utilizes an elastomer surround that resists colour fading or running. An Acrylonitrile-Elastomer Styrene (AES) Glass Fibre Reinforced Basket protects the magnetic circuit. The speakers also sport the pure white AES grilles to keep the pure white colour on a long term which resist s fading and yellowing caused by direct sunlight and heat. And finally, gold tinsel wire and gold plated wire terminals are used to prevent any corrosion and possible interference in audio signal transfer caused by corrosion.