H.W. swabs are made from a proprietary micro-fiber material that will not shed, shrink, or bleed. Insert your H.W. Pad-Saver® into your instrument to instantly wick corrosive moisture from pads, tone holes, and bore, extending the life of the pads and saving money on frequent repairs H.W. PadSaver de-moisturizers are designed to be left in the instrument while not being played. These swabs draw and dissipate moisture from the bore, tone holes, and pads; extending the life of the pads and saving money on frequent repairs.