The paintball gun I got these for broke before I could test these with it. That being said I have been able to use them with a slingshot, and they go through both sides of a single layer of a standard thickness cardboard box at best, one layer at worst. Keep in mind this is at 1/2 the speed of a paintball gun at best; probably closer to 1/3.



These are no joke and it would be excruciating to get hit by one of these. They should definitely not be used against living things, and could cause some serious damage.



If you want these for self defense, I reckon someone not wearing heavy layers of clothing might think they were shot with a real bullet if hit with one of these going a few hundred fps.



Stay safe.