

Butterfly packaging question
What are the little foam like material cards that spread butterflies are shipped in when bought for insect pinning? With the little slit in the middle for the body of the butterfly specimen to rest in. I just ordered a very large order of unmounted/folded specimens. And once I spread them I’d ideally like to store them in these little bags with whatever these foam boards are called until I use them for a project. It would just work best with how my setup is.