For the Ultimate Sensation!!! Insert the vibrating bullet into the hole on the bottom of the sleeve. Measurements Length: 6.5 in. - ( 165 mm ) Width: 2.8 in. - ( 71 mm ) Height: 2.8 in. - ( 71 mm ) Inner Diameter: 1.5 in. - ( 38 mm ) Oral Insertion Length: 5 in. - ( 127 mm )