Size Chart - Alto
| Alto the Chameleon | Mini | Small | Medium | Large | XL |
| Total Length | 6" | 7.25" | 8.5" | 10" | 12" |
| Insertable Length | 5.25" | 6" | 7.25" | 8.25" | 10.25" |
| Circumference of Head | 4.5" | 5.25" | 6" | 6.75" | 8" |
| Circumference of Shaft | 5.25" | 6" | 7" | 8.25" | 9.75" |
| Diameter of Head | 1.3" | 1.6" | 1.8" | 2.1" | 2.5" |
| Diameter of Shaft | 1.6" | 1.9" | 2.25" | 2.6" | 3" |