Driven gears are widely used in household electronic products (Massage chair, electric tools, etc.), medical equipment, office equipment (printers, fax machines), toys (aircraft models, robots, simulation car models, toy pistols), mechanical equipment, adult health products, auto parts, fishing gear and many other industries. Our products are sold to the United States, Germany, France, Spain, Australia, Canada, Japan, South Korea and other parts of the world because of their good quality and low price. If there is pitting or local black spots on the working surface of the gear, if the distribution area of the spots does not exceed 30% of the tooth surface, it can continue to be used.