A rubber stamp which enables you to imprint chord boxes above the lyrics to a song. As can be seen from the photograph the stamp imprints 4 vertical lines for the strings and 6 horizontal lines for the frets. All you need to do then is add the appropriate dots to represent the required chords
This stamp is particularly useful for left-handed players for whom, of course, the chords are the wrong way round from how they appear on sheet music etc. For all of us they can save a lot of time writing out the songs. One of these stamps plus an ink pad costs £9 each plus postage and packaging.