The H.W. Pad Saver is designed to fit into the bore of a clean, dry instrument, it wicks away residual moisture and keeps dust away from the pads. The sax neck model has a flexible shaft so it conforms to the contours of all saxophone goosenecks. Designed to fit into the bore of a clean, dry neck while it's in the case. There it wicks away residual moisture that can cause damaging corrosion.