I was thinking the same thing, mine are 16 inches but I just started the juice and wondering what would happen if I ended up getting even more into bodybuilding then I allready am and get 22 inch guns!!!! 6 inches is a huge amount I dont know what the avg. pro 's arm size is but im sure it is around there, so I am worried if a big change like 15 inches would make the tattoo move or look like shit (tribal arm band)