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I bought a knock off version of the CB-6000s, and it's worked great for me. I just rub some coconut oil around my parts and it slips on nicely. It has different ring sizes that fit around the balls so you can get the perfect fit.
what abou tthis.
As everyone else is saying, there are many options to fit your needs. I have personally purchased several different devices in an attempt to get the correct item that suits me.
My personal favorite is this one. It is a cb6000s clone, but I have worn it for 1 week straight with no issue at all with how it works.
Then I have this one as well which is silicone. My main issue with this one is that my penis is too wide when soft to slide into the main part properly, however I did use the silicone ring with the plastic CB6000S. Its a good combination of flexable and firm.
Now if you want to go metal, i was able to find the CB6000S in all metal after determining that a 5cm ring is what I needed to fit around my balls properly, found here
My main complaint with this one is that it can be heavy and slip down when Im active, but when relaxing in bed or bent over, it does a good job to say the least.
The last one that I purchased is this which I am not a big fan of. The cage itself fits nicely around my cock, but the big issue is that the hinge where the ring comes together can pinch skin and where the cage connects to the ring can pinch as well. This was also the first cage I ever purchased. I was happy to know that I fit a 5cm ring, but I could have done the same with either of the first two examples that I linked, as they come with a full set of rings, which I would highly recommend.
Best of luck with your endeavors and hopefully you are able to get one that fits you in all the right ways