The contract units of different commodities in futures are different. For example, rebar and soybean meal are both 10 tons, so adding one dollar to the disk is 10 yuan.

But many other commodity contract units are not like this. Plastic is 5 tons per lot, 1 minute corresponds to 5 yuan, iron ore is 100 tons per lot, 1 minute corresponds to 100 yuan and so on.