Table 2.
Optimal configuration of the medical ring
| Color | |
| Pink | Poor visibility |
| Green | Poor visibility |
| White | Good visibility |
| Black | Good visibility |
| Reviews of diameter (mm) | |
| 5 | Even if it gets wet, it opens and can be stored in sheath |
| 10 | Device will not open if it gets wet |
| 15 | Device will not open if it gets wet |
| Width (mm) | Operability |
| 0.5 | Poor |
| 1 | Poor |
| 1.5 | Good |
| 2 | Excellent |
| 2.5 | Good |
| 3 | Poor |
| Reviews of thickness (μm) | |
| 20 | Device will not open if it gets wet |
| 40 | Device will not open if it gets wet |
| 60 | Device will not open if it gets wet |
| 80 | Device will not open if it gets wet |
| 100 | Even if it gets wet, it opens; however, operability is affected to a certain degree |
| 200 | Good operability and sufficient growth was obtained |
| 300 | Sufficient growth was not obtained |