According to Sohu, most popular commodity contracts in China include:
http://money.sohu.com/s2008/7282/s257735449/index.shtml
Dalian - Soybean: A, 10 tons/contract, priced in RMB per ton, 5% margin. (Clearing fee: 4 RMB)
Dalian - Soybean Meal: M, 10 tons/contract, priced in RMB per ton, 7% margin. (Clearing fee: 3 RMB)
Zhengzhou - Wheat: WT, 10 tons/contract, priced RMB/ton, 5% margin. (2 RMB clearing)
Zhengzhou - "High Gluten Wheat": WS, all other parameters same as wheat.
Shanghai - Copper: CU, 5 tons/contract, priced in RMB per ton, 5% margin, clearing fee <0.02%.
Shanghai - Aluminum: AL, same as copper, 5 RMB clearing fee.
Shanghai - Natural rubber: RU, same as AL.
And a few newer instruments:
Zhengzhou - Cotton: CF, 5 tons/contract, RMBs per ton, 7% margin, 8 RMB clearing.
Corn and heating oil are also major listed contracts, but specs aren't given.