Coated in super soft jelly, these Vibrating Duo Balls are highly stimulating with their powerful vibrations. The duo spheres of the Vibrating Duo Balls become extremely slippery once lubricant is applied and ensure maximum comfort at all times. With powerful multi spped vibrations quickly adjusted via the hand held controller, you can go from mild to wild in an instant. Each of the Duo Balls measures 1.4 inches in diameter.