The Extender Hollow Vibrating Strap On. This 6 inch strap on set has a high quality dong, which is has a veined, life like shaft. The dong has multi-speed vibration to send shivers down the spine, and all over. Importantly, the dong is hollow. This allows the wearer to himself into the dong and be in the right position to deliver some good loving. The harness is elasticated to allow it to fit most hips. Get ready for some everlasting love. Vibrating dong requires 2 AA batteries, not included.