It's called tissue:
The tissue inside the penis is called the corpus cavernosa. When you are erect it fills up with blood and makes the penis hard. To make the penis bigger, these methods stretch this tissue to larger than normal, and then later the body repairs the tissue and once it is repaired you actually have more space in your penis for the blood to flow into. So, your penis looks bigger.
The tissue inside the penis is called the corpus cavernosa. When you are erect it fills up with blood and makes the penis hard. To make the penis bigger, these methods stretch this tissue to larger than normal, and then later the body repairs the tissue and once it is repaired you actually have more space in your penis for the blood to flow into. So, your penis looks bigger.