I just tried one last night and it worked well I used it for about an hour with no ill effects if your looking to buy one this one is rubber and is atached to a string of anal beads the sensation of the ring pulling as my wife moved away really added to the expieriance

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Some people they like to go out dancing
and other peoples they have to work, just watch me now
And there's even some evil mothers, haha
well they're gonna tell you that everything is just dirt
You know that women never really faint and that villains always blink their eyes, ooohhh
And that, you know children are the only ones who blush
and that life is just to die

sweet jane the velvet underground