After trying MANY different devices (like pretty much most people) and starting to think that I was being trolled with the idea of chastity. But I heard about extra large ring sizes for the CB-6000s and decided that it was going to be THE LAST time we try chastity. I've never been able to wear a device overnight, and most of the time couldn't keep 1 on for more than a few hours due to searing ball pain caused by my sack being wrinkled and folded under the ring. Turns out that the 2 1/8" ring gives me all the room I need. Have worn it 3 nights in a row and barely noticed it throughout the night and absolutely NO pain. My wife and I are VERY excited with the prospects. I need to take it off before work because my job requires a lot of bending and moving and I have had a ball slip through now and then(fun) and also I have nowhere to pee except outside and don't need it splattered all over my pants. So I guess my point is, if you are a high and tight person, and/or if your package is in the thick side I highly recommend trying the bigger ring sizes.
After 5 months of trying various combinations, I have hit upon the one that does not irritate me or cause pain. I started with the larger ring because it was comfortable. However, when I slept in it or had sex with it on, I had ball slippage. I next went to the next to largest size with small spacer and still the same problem. Last week I tried the third largest which I could never get to fit me before and it works perfectly. Since it is tight, there is no rubbing of the ring. Either that or my balls toughened up. I was very surprised that I could get it to fit but I have read here that after a while, guys need to go to the next smallest ring. I do not know how that happens but it happened to me. Great for you. I still have not decided to sleep with it on. I am not so much into wearing it as I am into chastity and I work at home with my wife nearby to supervise me so I really do not need it on me all the time.