Temporary buffs applied to a player's weapon. They stack with permanent enchantments, but not other temporary ones (such as sharpening stones, rogue poisons, and shaman weapon spells like Windfury). They are similarly wiped when you enter/leave an instance, or switch continents.
Usable only by enchanters to perform enchantments. Since they are BOP and gradually used as materials to make better rods, most enchanters will only ever make one of each kind of rod.
While most materials used by enchanters to make new enchantments are randomly gained by disenchanting items, some materials can also be made using other materials already in possession of the enchanter.