User blog comment:Maimer1882/Metal.../@comment-3146930-20110929025457/@comment-3146930-20110929160906

The hunters use silver against the wolves as silver has always been used against werewolves so it makes sense. I also know they carry silver bows, but I dont know if they only use silver arrows or simply had them to attack the wolves (as they said they were hunting him). As another argument completely unrelated to the above statement, the other metals are mythical metals mostly created for the series (as there isnt anything like imperial gold or stygian iron in real life), but silver exists in real life and the series and may not be mythical, but the arrows themselves could be magic and regular silver may only work on werewolves.