Barbed Wire Coil is a Crafting component for Barbed Wire (base structure) and various recipes with Aluminium Bolts and Aluminium Arrows. Barbed Wire Coil will make the ammunition cause more Bleeding, draining the life out of the target at a faster pace.

Being a rather rare find on Orca Island, Barbed Wire Coil can be hard to find in large quantities. There doesn't seem to be any specific location where it could be found with a high likelihood, but garages, supermarkets and hardware stores are a good place to start looking.