I'm satisfied with the size of my balls, (testicles), but I wish they would hang lower when I have an erection. A=Usually they are tight and raised up, unless I am very warm, especially when in a bathtub or sunbathing.
Most of the metal ball rings and ball weights are really heavy and felt extreme when I tried them out. I just wanted my ball-sack to hang down lower, but I don't want them to stretch to the floor!
A few years ago, I started wearing silicone ball rings for stretching them downward, but after a while they became ineffective.
So, I made my own ball-stretching strap out of an old, very well-worn cowboy belt that I inherited from my grandfather. I softened the leather with mink oil, and cut an 8 inch length of it, then added two snaps to it, so that I had two choices of tightness, depending how warm and relaxed my scrotum was at the time.
If I wear it for a few hours, or even all day, it gives my balls a good stretch, that is also very comfortable.