Reddit reviews Black PVC Rubber Pin Backs Pack of 50
We found 2 Reddit comments about Black PVC Rubber Pin Backs Pack of 50. Here are the top ones, ranked by their Reddit score.
Fits Securely on all Lapel PinsUse for all Lapel Pins, Tie Tacks, Citation Bars, Service Bars and JewelryThe clutch is 12mm in diameter and fits snug that and makes the clutch easy to remove from the pin.New tall design pins won't poke through and stay tight to garmentIf it does not have the The Pin People logo brand, it's not original
Here, they are called "Pin Backs"
This is definitely the correct answer. They are a type of butterfly clutch, just plastic instead of metal. Here are some that look just like the one in OP.