China's treasury bond futures opened mixed on Monday, with contract for settlement in June opening flat at 93.1 yuan (about 14.9 U.S. dollars). The contract for settlement in September went down 0.1 points to open at 93.7 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 and started trading on Sept. 6, 2013.