The Wolo 115 is 100% stainless steel 304 non-magnetic grade with a bright polished finish that will not rust. Designed for exterior mounting on any 12-volt vehicle; trucks, SUV's, RV's, and boats in a fresh or salt water environment and ideal for almost any weather condition. The Persuader is maintenance free and does not require a compressor or hoses. Includes a stainless steel adjustable trumpet support to prevent vibration. Comes complete with rubber gaskets and stainless steel mounting hardware. Packaged in an attractive full color box.