Size Chart - Atlas
| Atlas Size Chart | Small | Medium | Large |
| Total Length | 8" | 10.5" | 13" |
| Insertable Length | 6.5" | 8.75" | 11" |
| Circumference of Head | 5" | 6.25" | 7.75" |
| Circumference of Medial Ring | 5.25" | 6.5" | 8.25" |
| Circumference at Base | 5.5" | 7.25" | 9" |
| Diameter of Head | 1.6" | 2" | 2.45" |
| Diameter of Medial Ring | 1.7" | 2.1" | 2.6" |
| Diameter at Base of Shaft | 1.8" | 2.25" | 2.85" |