It's a simple cock ring, with a simple design. All you have to do is take the cock ring and place it around your semi-erect penis. Then use the buckle to close the cock ring. It will regulate the amount of blood that leaves your penis during sexual activity. This allows you to go for a longer period of time (much to the happiness of yourself and your partner). A good quality cock ring, such as this one, can help even the most durable of men possibly maintain an erection that much longer.
This cock ring can accommodate penises up to 8" in circumference. It measures 8.5" in length and .5" in width.