Heavy Silken Thread

Source
This item can be purchased for from:
 * in Swamp of Sorrows
 * in Stranglethorn Vale
 * in Stormwind City
 * in Stormwind City
 * in Wetlands
 * in Loch Modan
 * in Duskwood
 * in Alterac Valley
 * in Hillsbrad Foothills
 * in Duskwood
 * in Duskwood
 * in Stranglethorn Vale
 * in Stranglethorn Vale
 * in Redridge Mountains
 * in Hillsbrad Foothills
 * in Stranglethorn Vale
 * in Arathi Highlands
 * in Arathi Highlands
 * in Arathi Highlands
 * in Arathi Highlands
 * in Stranglethorn Vale
 * in Mulgore
 * in Redridge Mountains
 * in Redridge Mountains
 * in Durotar
 * in Durotar
 * in Durotar
 * in The Barrens
 * in Winterspring
 * in Ashenvale
 * in Ashenvale
 * in Ashenvale
 * in Teldrassil
 * in Darkshore
 * in Teldrassil
 * in Teldrassil
 * in Tirisfal Glades
 * in Tirisfal Glades
 * in Tirisfal Glades
 * in Tirisfal Glades
 * in Dustwallow Marsh
 * in Dun Morogh
 * in Alterac Valley
 * in Dun Morogh
 * in Dun Morogh
 * in Stormwind City
 * in The Barrens
 * in Durotar
 * in The Barrens
 * in Darkshore
 * in Dustwallow Marsh
 * in Tanaris
 * in Arathi Highlands
 * in Feralas
 * in Ashenvale
 * in Feralas
 * in Feralas
 * in Moonglade
 * in Feralas
 * in Feralas
 * in The Hinterlands
 * in Mulgore
 * in Dun Morogh
 * in Westfall
 * in Winterspring
 * in Felwood
 * in Swamp of Sorrows
 * in Moonglade
 * in Desolace
 * in Desolace
 * in Eastern Plaguelands
 * in Western Plaguelands
 * in Western Plaguelands
 * in Silithus
 * in Azshara
 * in The Hinterlands
 * in Silithus
 * in Eversong Woods
 * in Silvermoon City
 * in Silvermoon City
 * in Silvermoon City
 * in The Exodar
 * in The Exodar
 * in The Exodar
 * in Azuremyst Isle
 * in Zangarmarsh
 * in Eversong Woods
 * in Hellfire Peninsula
 * in Hellfire Peninsula
 * in Hellfire Peninsula
 * in Hellfire Peninsula
 * in Shattrath City
 * in Shattrath City
 * in Shattrath City
 * in Shadowmoon Valley
 * in Blade's Edge Mountains
 * in Shadowmoon Valley
 * in Shadowmoon Valley
 * in Zangarmarsh
 * in Blade's Edge Mountains

As an ingredient
This item is used to make:

Leatherworking

 * Dragonscale Breastplate
 * Gauntlets of the Sea
 * Feathered Breastplate
 * Tough Scorpid Helm
 * Helm of Fire
 * Tough Scorpid Leggings
 * Big Voodoo Cloak
 * Big Voodoo Robe
 * Big Voodoo Pants
 * Big Voodoo Mask
 * Nightscape Boots
 * Turtle Scale Helm
 * Dragonscale Gauntlets
 * Wolfshead Helm
 * Tough Scorpid Shoulders
 * Turtle Scale Bracers
 * Turtle Scale Gloves
 * Turtle Scale Leggings
 * Turtle Scale Breastplate

Tailoring

 * Admiral's Hat
 * Red Mageweave Pants
 * Simple Black Dress
 * Dreamweave Vest
 * Pink Mageweave Shirt
 * Black Mageweave Boots
 * Cindercloth Robe
 * Enchanted Mageweave Pouch
 * Shadowskin Gloves
 * Black Mageweave Robe
 * White Wedding Dress
 * Red Mageweave Shoulders
 * Tuxedo Jacket
 * Red Mageweave Gloves
 * Red Mageweave Headband
 * Shadoweave Robe
 * Black Mageweave Gloves
 * Tuxedo Pants
 * Red Mageweave Bag
 * Tuxedo Shirt
 * Orange Martial Shirt
 * Shadoweave Boots
 * Cindercloth Boots
 * Orange Mageweave Shirt
 * Shadoweave Mask
 * Red Mageweave Vest
 * Shadoweave Shoulders
 * Lavender Mageweave Shirt
 * Black Mageweave Shoulders
 * White Bandit Mask
 * Dreamweave Circlet
 * Shadoweave Pants
 * Shadoweave Gloves
 * Dreamweave Gloves
 * Black Mageweave Headband