In comprehensive tests, among others with our Chinese super stars Gue Yue (16 years old and bronze medal winner in Athens) and Qiu Yike (who beat Timo Boll at the World Championships in Paris), we have developed a rubber that encompasses all typical features of a Chinese rubber: very grippy, hard and extremely fast. But that was not nearly enough. Guo Yue especially demanded more rotation. Together with our Chinese manufacturer we finally found an upper rubber, whose composition is slightly softer. This makes it possible to play faster and harder topspins with rotation. Guo Yue was happy.