Mandolin Fretboard and Chord Chart Instructional Poster by Triple-G Posters. $7.95. This is a great learning tool for beginning and intermediate mandolin players. The 11" x 17" instructional guide is nice to hang on the wall wherever you practice for easy reference, instead of flipping through a book. This chart includes the notes of the mandolin displayed on the fretboard and a chord chart. This information can be found in books, but rarely on one easy to read chart!