Formula No. 65 has become the standard daily-use guitar care product line for pro guitar techs, repair shops, and guitarists worldwide. The 6504 kit contains all you need to properly maintain your guitar's fingerboard, finish, and strings. Formula 65 Polish creates a genuine, no-residue shine in a hurry, with the proper chemical balance to preserve any finish. Fretboard 65 Ultimate Lemon Oil is the perfect complement as it cleans away fingerboard grime and returns your fretboard to its original luster. Ultraglide 65 String Conditioner shields strings from tarnish and corrosion, extending their playing life.