Use it for your mouthpiece, your instrument or anything that needs delicate cleaning. Safely removes fingerprints and oils from Metal, Wood, Hard Rubber and Plastics. Microfiber is preferred for its very light-weight, super-absorbency and rapid drying properties. It is softer, finer and more absorbent than any other conventional cloth. With over 100,000 fibers per square inch, it's softer than the finest silk, yet extremely durable. Keep one in the case and one at home to maintain your precious musical equipment.