Metallic Fragments

Metallic Fragments are quest items needed by the Horde for the quest Natural Materials.

Source
Metallic fragments drop from mobs in Feralas and The Hinterlands:
 * Feralas
 * Hippogryphs in the Frayfeather Highlands
 * Wandering Forest Walkers
 * Sprite Darters
 * Giants
 * The Hinterlands
 * Owlbeasts

As a quest objective

 * Natural Materials