There\'s many different forms of
Girth enhancement. Most notably
PMMA, but
FFT, silicon, and others are also available.
It\'s best to get familiar with the board, read through the threads and gather some info about each method, the pros and cons, etc ect.
You will find years worth info (both positive and negative) on all forms of enhancement here.
I would start by searching for whatever you are interested in at the search bar at the top. As some people have good experiences that are permanent, others have not so its best to just explore the threads for a while and gather as much info as you can.