Copy of Size guidelines
| Gag size | The depth of penetration of the inner part | Your body height |
| XS | 58 mm | < 160 cm |
| S | 61 mm | 160 - 168 cm |
| M | 64 mm |
168 - 178 cm |
| L | 67 mm |
178 - 190 cm |
| XL | 70 mm |
> 190 cm |
Note: if your size is somewhere in the middle, or you are a beginner, then take the smaller gag. If you are more experienced user, then take the larger one.