Review on UKCOCO Stainless Entomology Butterfly Collectors: Efficient Solution for Entomologists and Naturalists by Adan Hudson

Maybe it's my ignorance but they were pretty flimsy and we had a hard time using them for the bug task we were doing. Just know that they are not super strong. We had a bit left over from the old ones and the new pins looked about the same thickness but definitely weren't as strong.