The inner plate indicates that the futures are traded at the purchase price, and the transaction price is the application price, indicating that the selling is more enthusiastic. The purchase price transaction is included in the inner disk: when the transaction price is the purchase price, the quantity on hand is added to the cumulative quantity in the inner disk. When the cumulative number of internal disks is far greater than the cumulative number of external disks, and the price falls, it shows that many people are selling. The outer disk is just the opposite. To be precise,

The outer disk indicates active buying and closing; The inner plate indicates active selling, reflecting the strength comparison between buyers and sellers.