The OH-14 Case Plus+ Humidifier uses the same evaporative membrane as the OH-5 Plus+ Humidifier, providing 50% more daily humidity than either the OH-6 Case Humidifier or the OH-1 Guitar Humidifier. This humidifier is designed for use in drier climates (desert, mountain or frigid north) where the relative humidity is below 25%. The OH-14 Case Plus+ Humidifier, like the OH-6 Case Humidifier, attaches to the inside of your instrument case. To accomplish this, two powerful neodymium magnets are inserted in the seam of the humidifier. The magnets attach to either a steel clip or a stainless steel strip with adhesive backing (both are provided with the humidifier). The steel clip fits over the side of your case, providing a flat vertical surface to which the magnets can adhere. The neodymium magnets are strong enough to keep the humidifier attached to the clip or strip, but still allow the user to remove the humidifier with ease.