CURVED NUT (ACOUSTIC AND ELECTRICAL) Capo for acoustic guitar (6 or 12 strings) and electric. Result of the collaboration between the well-known product designer Ned Steinberger and J. D'Addario &, Company. It employs a sleek, ultra-light design for quick and accurate one-handed placement of the nut on the guitar neck. Tighten the rotary knob to remove the hum from the strings and maintain perfect tuning. The light aluminum of the nut makes it almost invisible on the neck when used. Ultra-light aeronautical quality aluminum. One-handed operation. The fast micro-metric screw ensures perfect pressure for perfect tuning. Designed for 6 or 12 string guitars. A low profile design that does not prevent touching.