Oxballs' extra thick DONUT-2 cock rings are larger and thicker than the DONUT-1, and are made using their superior FLEX-TPR, a strong and durable material that stretches up to five times its original size. These rings can be worn together or individually in a variety of ways, including around the shaft of the penis to enhance and prolong erections, stacked as bumpers, or around the scrotum as ball stretchers.