Blood Guard's Satin Handwraps

The Blood Guard's Satin Handwraps are the cloth gloves of the Horde PvP-Rare Priest set called the Champion's Investiture.

Source
This item can be purchased from First Sergeant Hola'mahi located in the Hall of Legends in Orgrimmar. It costs 4125 Honor Points and 20 Alterac Valley Marks of Honor.