• Mystic Cogwheel
• Item Level 359Disenchants into:
  Not disenchantable
• Unique-Equipped
• +208 Resilience Rating
• Requires Engineering (525)
• "Only fits in a Cogwheel socket."

Fractured Cogwheel is a Cogwheel which is only usable by a Engineer.

Source

Sold by  Frank Natale in Highbank and  Zim Bamzabble in Dragonmaw Port in exchange for 55 .

Patches and hotfixes

• Patch 4.0.6 (8-Feb-2011): Added. 
  

External links

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