Vindicator's Dreadweave Cuffs

Introduced with Arena Season 3 to replace, and  all of which are no longer available for purchase.

Source
The cost is and is available from these PvP vendors:

Champions' Hall, Stormwind

Hall of Legends, Orgrimmar

Patches
Introduced in Patch 2.3.0.

In Patch 2.4, this item lost 3 stamina and gained 70 armor.