H.W.P. swabs are made from a proprietary micro-fiber material that will not shed, shrink, or bleed. Insert your H.W. Pad-SaverÂ® 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. Your H.W. Pad-SaverÂ® may be stored inside or outside the instrument.