Ernie ball 4225 Instrument Care 3-pack with Microfiber Polish Cloth 2OZ The Ernie Ball Instrument Care Kit has all the essential components for cleaning, maintaining, and enhancing the performance of your instrument. It includes a string cleaner that extends the lifespan of your strings and safeguards them from moisture and corrosion. The instrument polish removes grime, haze, and fingerprints, while the fretboard conditioner cleans and moisturizes your fretboard. The kit also includes a microfiber polishing cloth for effortless, no-mar application, ensuring your instrument always looks and sounds its best.