China's stock index futures closed lower on Tuesday, with the contract for February 2014, the most actively traded, down 1.1 percent from the previous trading day to close at 2,280.4 points. The March contract lost 1.15 percent to end at 2,285 points, while the June contract went down 1.07 percent to end at 2,286.2 points. The September contract edged down 1.1 percent to end the day at 2,286.2 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.