The black Capo Pro by D'Addario is made of top-quality aluminium (similar to that used in aeronautics) and is designed for use on acoustic or electric guitars, 6 or 12 strings. The NS Capo Pro guarantees string-free operation across the entire neck. Its patented micrometer-accurate adjustment mechanism allows the player to set the exact tension needed for open notes to sound without applying excessive force to the neck. This greatly reduces the need to retune your instrument after using the capo. Its slim, robust design will withstand the most powerful styles and the most intensive touring, while adding a minimum of weight to the instrument. The NS Pro by D'Addario capos are the result of an ongoing collaboration between renowned designer Ned Steinberger, Jim D'Addario and D'Addario.