Designed in conjunction with Ned Steinberger, the D'Addario CP-09 Tri-Action Capo employs easy-to-operate Tri-action geometry. The NS Tri-Action Capo from D'Addario assures buzz-free, in- tune performance at any fret. Not just the average capo on the market, D'Addario's Tri-Action Capos patent pending Tri-action geometry reduces the force required to open and close the capo and evenly applies tension regardless of guitar neck profile. Combining the micrometer tension adjustment and direct horizontal pressure, the Tri-Action capo virtually eliminates pulling the strings side to side and the need to retune during use. Additionally, the lightweight aluminum construction adds negligible weight to the neck of the instrument.