| Ring Material | Predicted Coupling Factor (Gyro Output × 10‒8) | |
| Clockwise | Counterclockwise | |
| Al | 2.30 | 1.74 |
| Nb | 3.22 | 1.24 |
| YBCO | 3.65 | 1.24 |
| TEFLON | 2.25 | 2.01 |
| Stainless Steel | 3.00 | 1.33 |