I've used them from time to time. They are a nice addition. Most of the stores around here sell cheap ones. Either get an adjustable one, or buy a package with different sizes. It's important to get a fair amount of pressure to trap the blood. They will keep you a bit harder than normal. To avoid damage, do not leave them on for a prolonged time and put them around the base of the cock only. DO NOT put them around the base of your balls or over your cock and balls. The balls should not be restricted.
Google is your friend if you have questions.
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