1. U.S. Treasury bonds: 10-year U.S. Treasury bonds are the main investment instruments of 10-year U.S. Treasury bonds, which belong to government debt and are guaranteed by the government, with very low risk.

2. Mortgage notes: 10 mortgage-backed securities are bonds issued in the currency based on mortgage loans, and the risk is slightly higher than that of national debt.

3. Corporate bonds: 10 corporate bonds are bonds issued according to the company's financial situation, which are guaranteed by the company and have high risks.

4. Dollar money market fund: 10-year dollar money market fund is a short-term financing tool with low risk but low interest income.