DESIGNED FOR 4 OR 5-STRING BANJOS AND MANDOLIN. MICROMETER TENSION ADJUSTMENT ASSURES BUZZ-FREE, IN-TUNE PERFORMANCE AT EVERY FRET. MICROMETER TENSION ADJUSTMENT ASSURES BUZZ-FREE, IN-TUNE PERFORMANCE AT EVERY FRET. LIGHTWEIGHT AIRCRAFT GRADE ALUMINUM CONSTRUCTION. ALSO AVAILABLE FOR STANDARD ELECTRIC AND ACOUSTIC GUITAR (MODEL PW-CP-02).