This 11" speaker back cover provides protection to the back side of the speakers, behind a bulkhead or wall. It covers wire connections and protects the speaker's cones. It hides and protects valuable speakers and is made of high-impact white ABS. The compact size fits PolyPlanar MA6600, MA6800, MA6900, MA5107, MA5950 speakers and MS150 subwoofer. Diameter Size: 11".