Amazon URL: https://www.amazon.com/Happygo-Ergo...inity-Hypoallergenic/dp/B01LY26SIQ?th=1&psc=1 I only tried the urethral tube for about an hour. I don't recommend it for wear while active because if the screw undoes itself the tube could go places not wanted (inwards). The cage is by far the most comfortable cock cage I have purchased to date. I have many including CB6000, older CBs, the new and old holy Trainer, and more.. When erect, skin can protrude from the bars and get and sort of pinch but this is more of my sensitivity. The cage is actually stainless steel. All edges that contact skin are buffed but up by the lock is a bit rough. The integrated lock works well. I am open to questions.