DETAILS:

• F1: for standard 6 string guitar with radius fretboard.
• F5: for standard Banjo and Mandolin
• F-5R: for radius fretboard Mandolin and Banjo

NOTE:   All models have been thoroughly tested on many vintage instruments, including 30s, 40s, and 50s Martins, 30s Gibson's, and most of the popular contemporary instruments, to ensure the best fit and performance.