Like all Yamaha products, 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.