The Ultimate Professional Grade Five-piece Care Pak for Stringed Instruments Products are used worldwide by Musicians, Repair Techs, Luthiers, and Collectors Polishes are safe on all guitar finishes including Nitrocellulose- Each bottle has 4 oz. Fretboard Oil uses 100% Natural Oils and safe on all unfinished Fretboards - 2 oz. Microfiber Towels are lint free, high quality, and washable - Each Towel is 16" x 12"