Board Thread:General Nerf discussion/@comment-30049823-20190523005157/@comment-30049823-20190523005525

Also noteworthy is that ball pit balls are waterproof and SUPER easy to find in the grass, unlike elite darts and vortex discs and rival rounds.

And although it says never to fire it indoors (I didn't test it, but I'm positive you could break a window with one of these and a tennis ball), ball pit balls turn harmless very quickly even with a really high muzzle velocity, since they're large but very lightweight.