Barcus Berry MAPLEBAR"The Maplebar" Magnetic Sound-Hole Pickup The Maplebar single-coil pickup drops neatly into the sound hole of your favorite acoustic guitar to faithfully reproduce its clear, warm tone. Constructed within an American Hard Rock Maple housing, the Maplebar slides quickly into the sound hole without tools or modification to the instrument. Foam rubber covered slots hold it in place without damage and a 12' cable with 1/4-Inch plug connects it to your sound source. For steel-string flat top acoustic guitars with round sound holes.