Polk Audio Atrium 60 All Weather Speakers (Pair, White) Pair of all weather speakers with mounting brackets 6.5-inch mineral-composite polymer cone with butyl-rubber suspension 1-inch titanium dome tweeter with a neodymium magnet Meets or exceeds ASTM D5894-Salt Fog, Mil Standard 810 Immersion and Mil Standard 883 Method 1009 8 for salt and corrosion tests Constructed of stainless steel and brass hardware for years of rustproof reliability