There are many such trading contracts in the outer disk, such as mini gold, mini S&P and so on. The subject matter is the same as the standard contract, but the contract scale is small and the deposit is small. Large crude oil 1000 barrels per hand, small crude oil 500 barrels per hand. Small crude oil contracts are small contracts for crude oil futures. Compared with standard contracts, they require less margin and handling fees, which can meet the needs of small capital investors.