The Ned Steinberger designed Tri-Action Capo was introduced by D'Addario in 2012 and has become one of their best selling capos. It is not your ordinary trigger-type capo. The compound tri-action assures buzz-free, in tune performance at any fret. The new design reduces the amount of force required to open and close the capo and applies even tension regardless of neck profile. Combined with the micrometer tension adjustment and direct horizontal pressure, it prevents side-pulling the strings out of tune, which can happen with other trigger style capos. The aircraft aluminum construction of this capo makes it very light. Works on 6 string acoustic guitars and electrics with radiused fretboards. Also has a built-in pick holder.