This beefy cock ring is made of 100% super stretchy silicone. A unique ball design creates extra stimulation points for a new experience. Made for comfort and durability. with a soft feel and non-roll design. its thick girth ensures a more powerful erection. The 3X stretch allows for one size to be used over cock. balls or both. The inner diameter measures 1.75 in. Outer diameter is 2.5 in. It is lubricant safe.