Made of alloy, strong and durable * Elegant, concise and curved shape design, fits Guitar and other musical instruments well, has excellent hand feeling. * Quality steel spring, stand wear and tear; Quality Silicon pad conforms to fingerboard and frets can ensure good sound and avoid scratching. * Excellent structure on the basis of mechanics theory design, easy to open, but can clamp firmly and easy to stay in tune. * Used for 7 strings Guitar, specially for Folk Guitar and Electric Guitar. Also can used for banjo, Ukulele, Mandolin and so on.