MICRODEAR-FSY® is a 100% polyester microfiber cloth developed by Unitika Trading Co. , Ltd. Its surface is covered by around 230,000 ultrafine wedge-shaped fibers per square centimeter and form a complicated concave-convex. It helps clean the difficultly removable tiny dust and oil stains. Adopting special 5-layered structures makes the cloth having a moderate volume and keeping the function even after washing it several times. Excellent water absorption and wiping performance. Having been put to raising processing on the front and back of the knitted fabric, it is gentle and soft to the touch. Never does any damage to the harmonica. Naturally you can use both sides.