The product of an ongoing collaboration between famed product designer Ned Steinberger and D'Addario. The compound action reduces the force necessary to open and close the capo. It also eliminates side-pulling the strings out of tune, which is prevalent on other trigger-type capos. Aircraft-quality aluminum construction adds virtually no weight to the guitar neck when in use and the capo can be clamped on the headstock when idle. Simply adjust the tactile micrometer tension control so there is just enough tension to eliminate string buzzing. *Incredibly easy one-handed operation made possible through patented, compound-action design *Micrometer tension adjustment assures buzz-free, in-tune performance at every fret *Designed to fit most 6- and 12- string guitar necks with radiused fingerboards.