The Fender Speed Slick guitar string cleaner prolongs the life of your instrument's strings. The simple and effective applicator is a snap to use. The treated applicator pad with our proprietary cleaning solution does all the work for you. Just rub it up and down your strings and wipe away clean with the included wiping cloth. The Fender Speed Slick cleaning solution is safe for any finish and/or fingerboard wood. · Material: 100% mineral/paraffin oil