What Cannot Be Shipped By FedEx?

What Cannot Be Shipped By FedEx? All commodities valued over US$20,000 without approval. One-of-a-kind/irreplaceable articles such as artwork valued over US$500,000 each. Flammables with a flash point of 140 degrees Fahrenheit or less. Auto parts with fluids in them. Fine art. Fine jewelry. Furs. Pornography/obscene material. What items are not allowed to be shipped? Air