• Proto-hide Leggings
• Item Level 226Disenchants into:
  [Abyss Crystal]: 1-2
• Binds when equipped
  
• Leather
• Legs
• 517 Armor
• +105 Agility
  +99 Stamina
• Yellow Socket
• Socket Bonus: +8 Attack Power
• Durability 90 / 90
• Requires Level 80
• Equip: Improves critical strike rating by 86.
  Equip: Increases your expertise rating by 57.
  Equip: Increases attack power by 148.
• 
• Sell Price: 11 54 65

Source

This item drops from Razorscale 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