Featuring a highly absorbent microfiber material, these cleaning swabs prevent corrosion and maximize instrument life by effectively removing moisture and grime from the interior of brass instruments. A nylon guide makes cleaning easy (the trombone version has a string guide). These swabs are constructed with the utmost care and attention to detail at our factory in Japan. Heavy-duty reinforced stitching combines with high-quality materials and expert craftsmanship to produce a finished product that’s worthy to use on the finest musical instruments. Microfiber is a synthetic fabric that’s extremely absorbent, strong and lint-free. The unique shape of the threads allows microfiber to trap moisture and grime much more effectively than traditional fabrics like cotton or wool, making microfiber the superior choice for cleaning. The specially designed shape gives this swab maximum contact with the inside of the instrument. This keeps more of the swab touching metal for the best possible cleaning effect while minimizing the chance of getting stuck around tight bends. The feeder cord is made completely from nylon so that your instrument won’t be scratched or damaged, inside or out.