It's spot crude oil, a continuous contract of American crude oil. Spot crude oil is a contract transaction, not a cash delivery transaction, but a transaction based on the principle of capital leverage. Spot crude oil requires investors to go through the delivery procedures within 1-2 working days after the transaction is completed. However, in the actual investment operation process, many investors do not choose to make actual delivery after the transaction is successful, but close their positions at maturity to earn the difference profit.