China's treasury bond futures closed mixed on Monday, with the contract for settlement in June closing flat at 93 yuan (15.09 U.S. dollars). The contract for settlement in September dropped 0.02 percent to close at 93.5 yuan, while the December contract gained 0.03 percent to close at 93.8 yuan. The contracts are agreements to buy or sell treasury bonds at a predetermined price and set date. They allow investors to bet on and 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.