Quercus Chord Box Printer for Guitar, Self-inking Stamp, Print image: 6 strings, 12 frets, Dimensions of the print: approx. 69 x 22 mm, Shape of the stamp: Trodat Printy 4915, No stamp pad needed, Doesn't cause discoloured hands, Small and light, Accurate placement, Easy to take, ideal for teaching, Chords, scales and arpeggios