Non-corrosive Lexan diaphragm, chrome plated solid crass. Includes compressor, air tubing, fittings & hardware. 9.5" long x 3.5" wide x 3.5" high. Maximum amp draw: 20 amps. db rating: 126 at one meter, 1/3 octave band fundamental frequency: 630 +/-15, 525 +/-15.