I've gone from 2" metal rings down to 40mm (just slightly larger than 1.5") metal rings as I've gotten more comfortable with using them. The 40mm is really, really tight and a bit uncomfortable, but EXTREMELY effective in use. I think the risk of getting a ring stuck is way overstated and, so long as you don't freakout and start forcing things back out, not really sure how you could get it stuck to the point of needing a run to the emergency room. Afterall, everything fit when you put the ring on. Relaxing, letting things simmer down, and then running a little lube around the inside of the ring and on the top of your penis will let you remove your penis and then your testicles (one at a time, of course).