Originally Posted by theguy
Older brands of Biodegradable BBs had a tendency to shatter upon impact, therefore a couple of fields in this area don't let people use them.
They're more resilient than past formulations but I still don't recommend playing with mesh goggles and there is a warning on the packaging about that. Fire PBR against a concrete wall I was able to split about every 3rd or 4th shot with a gun that cronied around 380fps. Broken pieces were not particularly jagged or sharp, and they didn't powder, which I thought was good. But styrene they are not.