1. The contract multiplier of small Hang Seng Index futures and options is HK$ 10 per point, which is one fifth of Hang Seng Index futures and options contracts.

2. Small Hang Seng Index futures and options contracts are designed for those who don't want to take too much risks, so that they can invest a small amount in the performance of index stocks.

3. On the other hand, the deposits of standard HSI futures and options contracts and small HSI futures and options contracts can offset each other, making the portfolio more flexible.

4. The contract months of small Hang Seng Index futures and options are the current month, the next month and the next two quarters.