metal cockrings are generally found in sizes (internal diameter) of 45mm, 47mm, 50mm and 53mm - approximately corresponding to 1/8" increments from 1 3/4" to 2 1/8". The two sizes i sell are 45mm and 50mm and have had perhaps one or two requests for the other sizes.

Unless you are particularly blessed with enormous girth, the 50mm should be safe for you to try on and get off in ordinary circumstances - i.e., don't pop a viagra, don the ring and plunge into a weekend-long play session. you're just asking to live out your own horror story!

the best way to put on a rigid cockring is to slip each ball through the ring first, then pull your dick through. often when we experiment with new toys and accessories, it's difficult not to become aroused - so you may have some initial frustration at not being able to get your dick through, the ring. just be patient - remember, you can actually 'break' your dick by trying to bend or fold it.

if it feels comfortable and provides just enough constriction to enhance your erection without painful throbbing, veins that appear ready to explode, everything going blue and becoming cold, you're in luck - no trip to casualty today.

the perfect fit would be small enough to provide some constriction when aroused, large enough to allow you to lose your erection with it on and small enough to do so without it falling off (the ring, that is!)

if you are still cautious, rather experiment with leather cockstraps or rubber cockrings (which can easily be cut off) until you have a sense of your own physiology and how it responds to various degrees of constriction. have a look at http://www.kinx.co.za/products/sections/cockandballwear.html for some of the many options available.

a halfway point may be to try using regular harness rings (see http://www.kinx.co.za/products/detail/HRharnessrings.html). these are chromed mild steel rings with a small enough gauge to be broken with bolt cutters (as opposed to the jaws-of-life under general anaesthetic - the horror stories are real!). avoid the cheap and nasty one's you find at local saddleries and leathercraft suppliers - they have nasty welds that will poke and perhaps even scratch or cut and stretch the definition of 'circular' to the very limit.

in, short: use your common sense and apply some caution, and if the very worst happens - try the following:

• relax and divert your attention away from the problem and any stimulatory factors (go make a cup of tea!)
• take a cool shower or bath. if you have, take medicine containing a vasoconstrictor such as ephedrine or pseudoephedrine (Sudafed or even something like Nobese as a last resort)
• if these steps don't help - don't delay in getting yourself to the emergency room. no matter how embarrassed you might feel - there is not much that these guys haven't seen and you are more likely to be regarded with sympathetic amusement than anything else. priapism (sustained and painful erection) is a serious physical health issue and emergency room staff are professionals whose duty it is to attend to the problem - nothing more.