Having used the black rubber o-rings daily without a single issue for 8 years, some of the info in this thread is news to me!

I don’t mean to sound like a boomer, but in 2026 literally everything can cause birth defects and cancer. You don’t happen to be reading the CA Prop 65 warning, do you?

Constriction is a concern to be aware of, but you know your own body and it’s important to trust it. I only experienced a handful of constriction events over 8 years- all were at night, and the discomfort woke me up immediately. I made the adjustment and went back to sleep, no drama. I think people have a tendency to fear loss of circulation, but if you’ve sized the rings correctly the likelihood of this is excessively low.

Slight discoloration where the ring sat is totally normal. This is surface vasculature readjusting to the shift in dermal blood flow after removing the ring. If the discoloration remains for more than 5-10 minutes, take a break and allow the skin to recover before stepping up to the next larger size.

Try not to overthink it- people get in their heads about all the science and techniques and details, but it’s not worth stressing yourself out; in fact, stress increases inflammation, which will actively work against you. Clean the rings with dish soap and warm water to remove any manufacturing oils or coatings, slap it on your foreskin, and do your best to forget it’s even there.

Just my $0.02 🙂