Penis extenders are plastic devices that are worn along the penis. They usually have a plastic ring that sits at the base of a flaccid penis, and another ring at the head, with a traction device that runs along the sides of the shaft. The wearer adjusts springs which pull the penile shaft, with the intention of literally stretching the flaccid penis to become bigger in size. Some data suggest there could be truth to their claims, but professionals and men who have tried them are skeptical. And that’s not getting into how penis extenders cause pain and even possible bodily damage.