China's treasury bond futures opened mixed on Wednesday, with contract for settlement in June opening flat at 92.52 yuan (15.02 U.S. dollars). The contract for settlement in September opened 0.006 yuan higher at 92.9 yuan. The contracts are agreements to buy or sell treasury bonds at a predetermined price and set date. They allow investors to bet on or profit from the movements in the value of the bonds. The treasury bond futures were launched at the Shanghai-based China Financial Futures Exchange (CFFEX) and started trading on Sept. 6, 2013. The CFFEX set the base value for the December 2013 contract at 94.168 yuan, the March 2014 contract at 94.188 yuan and the June 2014 contract at 94.218 yuan.