Size tube
Dav :If you measure the circumference of your penis and divide that number by 3.1416 the answer will be the diameter of your penis.If you want girth, then order a size bigger by a quarter inch or so, but not too big because you can trap a testicle and that’s a big ouch. If you want length, order the nearest one to your diameter, so that all the pull from the vacuum will be longitudinal.It’s a really good idea to alternate your pumping with jelquing — (Read avocet 8’s letter.) Good luck and good growth.