The dark blue rod is 10 mm. I’m able to use rods up to between 12 and 13 mm in diameter.

It has taken me a while to get to the point of having basically no pain at all. About 9 years.
Now it’s very much a piston/cylinder feeling inside my dick. Very smooth and slick.

I think maybe I could have shortened that to about 5 - 6 years if I weren’t so addicted and allowed more healing time between sessions. But even the pain can be pleasurable as long as it’s not overdone.

Usually I pull the rod out just as I’m cumming, but if I’m using a smaller rod I may leave it in, in which case it oozes/squirts out around the rod.