Editing Harmonica (section)

===Wind-savers===
Wind-savers are one-way valves made from thin strips of plastic, knit paper, leather, or Teflon glued to the reed plate. They are typically found in chromatic harmonicas, chord harmonicas, and many octave-tuned harmonicas. Wind-savers are used when two reeds share a cell and leakage through the nonplaying reed would be significant. For example, when a draw note is played, the valve on the blow reed-slot is sucked shut, preventing air from leaking through the inactive blow reed. An exception to this is the now-discontinued Hohner XB-40, on which valves are placed not to isolate single reeds, but rather to isolate entire chambers from being active, a design that made playing traditional blues bends possible on all reeds.