How FastSize Extender Works
The penis is made up of three main cylinders, two of which are called the "Corpora Cavernosa." When aroused, these cylinders fill with blood, giving the male an erection. The third cylinder, called the "Corpus Spongiosum" is located in-between the two Cavernosa cylinders, and is where semen is ejaculated. 
When the Fastsize Extender is worn, the tissue inside of the penis is stretched very slowly over an extended time period. This shallow yet effective use of traction allows for an adaptation of the penis.
The FastSize Extender uses traction to assist the human body's natural ability to change and develop under physical influence. By exposing the penis to a durable and regular traction, the cells in the penis chambers begin to divide and multiply, increasing the tissue mass. This process allows the penis to hold more blood than it could before. As a result, enlargement can be noticed in both length and width (girth) of the penis.
Because it is being stretched, cells first begin to break down and then multiply to fill the new tissue areas being created by the traction. This results in the eventual increase in length and girth of the penis, by a completely safe and natural means of enlargement.
The process is not painful by any means. Because it is a stretch made over time, and very slightly, the penis adapts all throughout the enlarging. The identical is used by hundreds of doctors every day to treat burn victims and other patients that require traction to amend their problems. It works!
Increasing Both Length and Girth of the Penis
Here's how the penis gains both length and girth (the answer can be somewhat difficult to understand). While your penis is extended outward, the cell count and overall capacity of your penis is expanding. By stretching the penis in length, you can initiate growth in both length and girth due to the reaction capacity of the tissues within your penis. 
This reaction triggers a cellular multiplication when they are subjected to a continuous force of traction. Because of this multiplication, you can observe two drastic changes.
At the microscopic level there can be an increase in the number of newly formed cells, which results in significant increases in tissue mass. You can also observe an additional capacity of blood flow to the penis, which results in stronger and harder erections during intimacy. At the macroscopic level, you can observe an increase in penile length and girth in both the flaccid and erect states.
