Here is a rubber stamp that produces a section of the guitar fingerboard grid that is 1/2 inch square. The idea for this educational item is to be able to easily write in the chord fingering positions for those chords that have yet to be memorized. As you know, while many guitar music books show the spelling of each chord, many books do not. Sometimes even more advanced students need help to learn a few stubborn chord fingerings. Here's how this works. Stamp the grid where the chord starts, then draw in dots to diagram the fingering position. Only the chords that are difficult to remember, need to be stamped in. Made in the USA.