Most banjo, mandolin, or bouzouki fretboards do NOT have a radius. If you’re not sure, chances are that yours is flat. Model 5 — “for Banjo, also fits most mandolins and bouzoukis” — covers four strings, or string pairs. On a 5-string banjo, the 5th string is dealt with separately, either with spike installed in the fretboard, or with our own 5th string capo. The model 5 is also a good fit on various other 4-string instruments, including tenor guitar and ukulele, although we do have models specifically for uke (L9 and C9b). The model 5 has been used famously by Andy McKee as a partial capo, covering four strings of his guitar, on his tune Rylynn. When the Shubb capo was first introduced about 40 years ago, guitarists throughout the world fell in love with it. They’re still in love with it today. We’ve given it a few tweaks through the years, but its basic mechanical principle remains the same: a unique over-center locking mechanism that provides an unrivaled combination of power, speed, accuracy and ease of use. One smooth flip of the lever locks it securely in place, and removes it just as quickly. And the Shubb capo is BY FAR the best at not creating tuning problems. Its soft, resilient rubber is specially designed to work just like a fingertip, so it doesn’t bend the strings over the frets. Its closing action is just like your hand, so it doesn’t pull the string off center. As a result, no re-tuning is necessary!