Duits 
Engels 
Frans 
Nederlands 
Spaans 
Beschreibung
- Comes in two different stiffnesses of rubber
- Ambidextrous design
| Spacer/ring size | Measured length |
| 17 | 56.5 mm |
| 18 | 59.5 mm |
| 19 | 62.5 mm |
| 20 | 66 mm |
| 21 | 69 mm |
| 22 | 72.5 mm |
| 23 | 76 mm |
| 24 | 79 mm |
| 25 | 82 mm |
To work out what size ring you need take the thickest part of the middle finger, wrap a strip of paper around it and mark where it overlaps. Now you can measure the length of the strip and compare it to the chart. Generally if you are between sizes then go for the smaller size.