I was going to link to the article on Wikipedia, but there's pictures of male genitalia on there, so I decided against it. Just go to Wikipedia and search "c**k ring" and you should get the correct article.
As for whether or not you can use them with condoms, try here: http://www.comeasyouare.com/default/index.cfm/sex-tips/sex-how-tos/how-to-use-a-c**k-ring/
Quote:
c**k rings and condomsYou can use c**k rings with condoms as long as you are careful that the ring isn't in a position where it can tear the condom. c**k rings that fit on the shaft of the p***s aren't recommended for use with condoms, only those that fit behind the scrotum.
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