Futures exchanges generally require a 5% margin, but there are some exceptions. For example, gold is 7%, and futures companies generally add a few points on this basis, usually 3-5 points.

The margin has nothing to do with the trading unit, but the tonnage of the primary hand is related to the value of the variety, and the metal is generally primary.

5 tons, agricultural products are generally 10 tons, and gold is 3000 grams, depending on the contract content of the variety.