Kirsten has been committed to manufacture high quality, comfortable, durable, anti-rust as one of the string. As a result, Kirsten developed independently three professioanl nano-film technologies which are OPF/ONF/FF;To ensure the quality of our products,we adopt advanced imported machinery and equipment (Germany Automatic CNC Wound Machines,Vibration Tester Machine,Ultrathin Anti-rust Coatong Machines). After years of precipitation, Kirsten gathered the talents from all over the world who have more than 20 years experiences in producing strings, so now we have an innovative production line with international standards.