Netherweb Spider Silk

Source
This item drops from:
 * Coldmist Widow in Karazhan
 * Blackfang Tarantula in The Black Morass
 * Hyakiss the Lurker in Karazhan
 * Crypt Fiend in Hyjal Summit
 * Deathskitter in Terokkar Forest
 * Coldmist Stalker in Karazhan
 * Dreadfang Lurker in Terokkar Forest
 * Dreadfang Widow in Terokkar Forest

Netherweb Spider Silk as an ingredient
This item is used to make:
 * Spellfire Bag
 * Frozen Shadoweave Boots
 * Imbued Netherweave Tunic
 * Frozen Shadoweave Shoulders
 * Ebon Shadowbag
 * Spellfire Belt
 * Imbued Netherweave Robe
 * Lifeblood Belt
 * Primal Mooncloth Shoulders
 * Frozen Shadoweave Robe
 * Spellfire Robe
 * Spellfire Gloves
 * Primal Mooncloth Robe
 * Imbued Netherweave Bag
 * Primal Mooncloth Belt
 * Imbued Netherweave Boots
 * Primal Mooncloth Bag
 * Cloak of Arcane Evasion
 * Imbued Netherweave Pants