There are lots of reasons to experiment with a penis pump—beyond a prop for your Austin Powers Halloween costume. Some guys with erectile dysfunction find them super helpful. Some trans dudes find them useful to encourage clitoral growth over time. And yes, some guys use them to make their junk a little bigger. Look: It’s no secret that penis enlargement is something many people wish for. Some dabble in taking sketchy supplements, applying topical creams, or doing daily dick exercises that claim they’ll boost your measurements. Some folks even go so far as to get their junk augmented surgically, like with penile implants, which can be expensive and complicated—but at least some are FDA approved! Oh, the lengths to which people will go to change their penis size, whether it’s length or girth.

While there’s no way to magically make your member bigger without risk and/or expense, using a penis pump can at least give you a temporary increase in size, and some pumping devotees even claim to have gotten permanently bigger by using a pump regularly over a long period of time.

Penis pumps work by applying suction to increase blood flow to the penis. (And if you didn’t know how an erection works, it’s when blood vessels in the penis expand—during arousal—to allow blood to fill them so you can get a hard-on.) This is why pumps are also sometimes recommended for easing erectile dysfunction, especially when used in combination with a cock ring, which can help keep your boner as hard as you want it for as long as you need it.

But even if you don’t struggle with size insecurities or erection issues, pumps can still be pleasurable and fun. Just remember to go low and slow, and use a good lube inside the pump for comfort’s sake. If you feel any tingling, numbness, or other strange sensations, heed those signals from your body and call it a day; it would suck to accidentally break your dick, right?

Here are some of the best penis pumps to get your blood pumping.