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"