Zero Glide Classical Guitar Nut / Zero Fret with Classical Guitar Specifications 52mm Designed Specifically for Classical Guitar with dimentions for optimal playing action Special 52mm long / Desired 42.5mm string spacing, 5mm Width Special offset nut slots allowing extra room between high E string and fretboard edge Offer includes 3M polishing cloths for final finishing / easy installation with instructions Improves Tuning Stability, Consistancy of Tone. Open string tone same as fretted notes!