For steel string guitar. Fits almost all acoustic and electric steel string guitars. 2 inches wide, curved for a radiused fretboard. What makes the Shubb capo so special? For one thing, its ingenious design: a patented locking action which provides an unrivalled 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 doesn't create 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!