China's stock index futures opened mixed Friday. The contract for settlement in February, the most actively traded, opened 4.2 points lower at 3,238.

The March 2011 contract opened at 3,262, unchanged from the previous close. And the contract for settlement in June gained 4.4 points at the opening to 3,338.8.

The contract for settlement in September opened at 3,379.2, down 1 points.

The stock-index contracts, agreements to buy or sell the Hushen 300 Index at a present value on an agreed date, are designed to allow investors to bet on and profit from both gains and declines in the market.

The index futures were 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.