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Drops from Anub'Arak in Trial of the Crusader, 25men normal version.
Probably this is the horde version of
Gloves of the Lifeless Touch
Near identical stats to the Sunstrider's Gauntlets of Triumph that mages use, with the haste and crit rating stats swapped.
Very good gloves as an alternate or even slight upgrade if you don't need gloves for a set bonus, since at this gear level haste is better than crit in 99% of cases as a DPS caster.