The System 65 String Change Tech Pack has everything you need to change your strings, whether you need to do it quickly in the middle of a set, or you can take the time to give it the professional treatment on the workbench. Includes a bonus System 65 Body & Fingerboard Kit—Formula 65 Cleaner-Polish, Fretboard 65 Ultimate Lemon Oil, and two Polish Cloths—for when you want to give your instrument some TLC in the middle of a string change.