It depends, I find they hurt like a b@stard when you get one to the noggin or the knuckle, but otherwise they lose their impact energy much faster on loose clothing and you can barely feel them. I recommend about 230-240 fps if you're shooting at people with them, but trust me, if you're using them in your garden you won't have them long, they disappear into nooks and crannies like noones business. We lose about 500 a year in a well lit gym so your backyard will swallow them up (and they ain't cheap).