The Vibrating Expendable Butt Plug pumps to expand up to 12 inches in circumference and 5.5 inches in length. This huge butt plug is ribbed for added stimulation. It has a 3 speed controller for extra strong vibrations. The butt plug is manufactured from extra soft rubber. 3 AA batteries required. You may want to try something different by stroking a penis sleeve at the same time if you are a guy.