This is a futures contract, rb is its code, 1710 means that the futures contract for delivery in October 2017 is relative to the spot. The futures contract refers to the futures contract formulated by the futures exchange and stipulated in the future. A standardized contract for delivery of a certain quantity and quality of goods at a specific time and place. It is the object of futures trading. Futures trading participants transfer price risks and obtain risk returns by buying and selling futures contracts on futures exchanges.