| Ring Material | Experimental Coupling Factor (Gyro Output × 10‒8) | |
| Clockwise | Counterclockwise | |
| Al | 2.1 ± 0.8 | −2.2 ± 0.5 |
| Nb | 5.7 ± 0.4 | 4.8 ± 0.5 |
| YBCO | 3.1 ± 0.4 | 0.3 ± 0.4 |
| TEFLON | 3.4 ± 0.2 | −0.5 ± 0.2 |
| Stainless Steel | 3.4 ± 0.5 | −4.7 ± 0.9 |