Falcon's Call

Falcon's Call is used on leg and head armor to permanently increase ranged attack power, stamina, and chance to hit.

Source
Falcon's Call is a quest reward from the quest Falcon's Call (quest) which starts with Zanza the Restless in Zul'Gurub in Stranglethorn Vale. To complete the quest, you must turn the following items to Zanza the Restless:
 * 1 Primal Hakkari Idol
 * 1 Punctured Voodoo Doll (hunter)