• Relentless Gladiator's Cuffs of Alacrity
• Item Level 245Disenchants into:
  [Abyss Crystal]: 1-2
• Binds when picked up
  
• Cloth
• Wrist
• 145 Armor
• +86 Stamina
  +38 Intellect
• Durability 35 / 35
• Classes: Priest, Mage, Warlock
• Requires Level 80
• Requires personal and team arena rating of 1200
• Equip: Improves your resilience rating by 50.
  Equip: Improves haste rating by 50.
  Equip: Increases spell power by 89.
• 

Source

This item drops from Koralon the Flame Watcher in the 25-man version and Toravon the Ice Watcher in the 10-man version of Vault of Archavon.

This item is also sold by the following vendors for 21,700 :

•  Captain Dirgehammer <Apprentice Armor Quartermaster> in Stormwind City
•  Sergeant Thunderhorn <Apprentice Armor Quartermaster> in Orgrimmar

Patch changes

• Patch 3.2.0 (04-Aug-2009): Added. 
  

External links

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