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I've only messed with one (actually a hair tie) once in the past year or so and I took it off pretty fast because it was uncomfortable. It was several years before then since the previous time. Not really sure the difference between that and a ball stretcher. What I've messed with is esentially a ring around the base of the shaft and another around the top ofthe scrotum. they do cut the flow of blood away from the penis, the deeper vessels still provide flow to it, which is the intended effect: a much firmer and slightly larger erection.
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