1. Commodity information: including coal type, quality standard, quantity, unit price, delivery place and other information.
2. Delivery time: that is, the delivery cycle, including the start and end time.
3. Mode of delivery: usually refers to domestic transportation or export transportation.
4. Terms of payment: generally, there are letters of credit, checks and drafts.
5. Liability for breach of contract: that is, the liability and compensation arising from breach of contract, including the liquidated damages and compensation amount that the breaching party should bear.