Although advertised as a bi-polar electro ring set to us, we discovered that it was not electrically conductive at all.  So, looking at it objectively, said hey, it definitely could be used as a two-stage cock ring.  

The inside diameter of the small ring is 1-1/4″ and the diameter of the larger one is 1-1/2″.  The distance between the rings (spacer) is 5/8″.

Made with high-quality soft silicone construction and crafted using medical grade silicone, this Cock Ring ensures a safe, smooth, and comfortable experience. The material is durable, skin-friendly, and free from harmful chemicals, making it ideal for sensitive use.  Placed at the base of the penis where the girth is the largest using the larger diameter, it will hold the blood in the shaft once erect.  The second, smaller ring, ensures the blood stays in the penis even when the user may begin to get flaccid.  Just be sure that this device is not too tight by measuring the smaller ring first.  We recommend that you measure the penis diameter while erect first before using.