Natural Male Enhancement rings work by restricting the flow of blood out of the penis, keeping it engorged. The vessels that bring blood into the penis during erection are farther from the surface than the veins that carry blood away. Natural Male Enhancement ring exerts pressure on the surface vessels. This doesn't cut off the blood circulation to your penis, but slows it down, improving erection size, rigidity and duration. This is the only medically endorsed use of Natural Male Enhancement rings. Ring style may vary.