China's stock index futures closed lower on Friday, with the contract for December down 2.27 percent from the previous trading day to close at 2,289.2 points. The Jan. 2014 contract, the most actively traded, fell 2.12 percent to end at 2,300.6. The March 2014 contract shed fell 1.91 percent to 2,316 points, while the June 2014 contract went down 1.79 percent to 2,320.2 points. The stock-index contracts, agreements to buy or sell the Hushen 300 Index at a preset value on an agreed date, are designed to allow investors to bet on and profit from either gains or declines in the market. The index futures was launched at the China Financial Futures Exchange (CFFEX) and started trading from April 16, 2010. The CFFEX has set the base value for all the four contracts at 3,399 points.