yes, I know it, in order to grow in thickness, but my interest is the lenght. I just wanted to know whether I could use a cilinder with an inside-diameter of 34 mm in order to stretch my penis in lenght. I have already been using a cilinder with a smaller circunference (44mm) then that of my penis and it works. The question is whether I should try with a smaller cilinder.
So I do not know whether a inside-diameter of 34 mm would be a bit too small for my penis.
My penis has a circunference of 15,5 cm, namely a diameter of 5 cm.