This humbucking magnetic soundhole pickup produces a warm and full sound while also greatly reducing hum and unwanted interference. It also shares the same neodymium magnet structure as the award-winning Rare Earth® pickup for exceptional string balance and incredible acoustic clarity. It’s low-profile, high impedance design needs no battery. When you need to play in high-volume situations, the integrated soundhole cover reduces the build-up of energy inside the guitar that often leads to uncontrollable howling. Made of a flexible elastomer that will not react with most finishes, it requires no tools for installation and fits most flat-top guitars with a 3-7/8” or 4” diameter soundhole. Neodymium magnet structure for exceptional string balance and sparkling acoustic clarity Integrated feedback-buster for high-volume playing Low-profile, high-impedance design needs no battery Flexible surround reduces “howling” in high-volume situations Fits soundholes with 3-7/8” (984mm) or 4 Easy installation with no alteration fits most standard acoustic guitars with a 3-7/8” or 4” diameter soundhole nánar