China\'s stock index futures closed mixed on Friday, with the contract for October up 0.6 percent from the previous trading day to 2,428.4 points. The November contract, the most actively traded, gained 0.18 percent to 2,415 points. The December contract rose 0.1 percent to 2,417 points, while the March 2014 contract edged down 0.1 percent to 2,427.2 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.