Mine are about 1.75 X 2.5 or about the size of extra large eggs, but they will vary in size daily and the left one will shrink down more than the right one due to the androgel that I started applying about a year ago. I stopped applying the stuff on a regular basis three or four months ago after I got tired of watching them shrink to nearly the size of medium eggs. I rather liked them big except when going "comando," as I like to tell my wife; they do get in the way when sitting in the car for instance. The androgel didn't seem to help all that much and viagra and cialis didn't seem to help. So I tried doubling the dose and only applying about once a week for a few days. My ball size has returned for the most part but they are a bit softer. Now I need to see a urologist rather than the GP I have been seeing to iron all this out. I get hard as a rock with a cock ring but viagra doesn't work? WTF is that all about? Need to try it with the increased dose of androgel to see if that may be it. I do have other medical problems such as high blood pressure that norvasc seems to control.
I really urge you to read Jean Carper's book
"The miracle Heart"
It offers a whole chapter on controlling your blood presure
It is an easy and intersting read. You can get in in paper back, new or used on bn.com, ebay or amazon, it's also probably in your local bookstore and Library or the can order it.
Having a miracle heart often leads to having a "miracle penis"
All our health is interconnected. Sometimes blood pressure can be connected to impotence. It may be something else in your case.
Maybe you just like the cockring - if it works, why not?
Try to avoid getting into the cycle of drugs and side effects if you can.
Best wishes for good health.