These small "squeegees" are made of brass with cloth-covered blades; they allow you to quickly reach through the strings of a grand piano to dust the soundboard. Use your vacuum to pull the dust off the cleaner each time it is withdrawn from the strings. For very dirty boards, use the cleaner to push a dampened cloth; this allows more pressure to be applied and gives more even coverage than is possible with a conventional soundboard steel, and they won't scratch the soundboard. These cleaners are ideal for removing the dirt and dust that accumulates under the strings of a grand piano. These cleaners are also preferred for tough stains and caked on dirt because you can apply extra pressure for removing stubborn stains. A set includes three sizes to work in different areas of the soundboard: Small - 2 1/2" blade w/5" handle for high treble, bass bridge aprons, etc. Medium - 3 3/4" blade w/6" handle for tenor & treble, damper guide rails. Large - 3 3/4" blade w/22" handle for reaching under the bass strings and reaching through plate holes to the back side of the bridge. Used and endorsed by PianoMart.com. Price includes shipping in continental US.