• Leggings of the Stoneweaver
• Item Level 226Disenchants into:
  [Abyss Crystal]: 1-2
• Binds when equipped
  
• Mail
• Legs
• 1150 Armor
• +99 Stamina
  +81 Intellect
• Red Socket
• Socket Bonus: +2 mana per 5 sec.
• Durability 105 / 105
• Requires Level 80
• Equip: Improves critical strike rating by 60.
  Equip: Restores 30 mana per 5 sec.
  Equip: Increases spell power by 124.
• 
• Sell Price: 13 85 32

Source

This item can be found inside Cache of Living Stone after defeating Kologarn in the 25-man version of Ulduar.

Patch changes

• Patch 3.1.0 (14-Apr-2009): Added. 
  

External links

• Battle.net (EU)
• Wowhead
• Thottbot
• WoWDB