Polyglass cone with butyl rubber surround. Power range: 50-200 watts RMS. Sealed box volume: 0.35-0.71 cubic feet. The item "FOCAL POLYGLASS 21V2 8 500W CAR AUDIO 4OHM SUBWOOFER CLEAN BASS SPEAKER" is in sale since Sunday, May 20, 2018. This item is in the category "Consumer Electronics\Vehicle Electronics & GPS\Car Audio\Car Subwoofers".The seller is "sammyg35x" and is located in Beverly Hills, California. This item can be shipped to United States.