Murloc Female Mask

Murloc Female Mask is a mask that can be used by players at any level that not only places a the mask on the players face, but also provides a small buff. This mask increases your agility by 35 (for level 85 players).

Source
These are purchasable in stacks of 5 for from the mask vendors:  just outside Stormwind City and  in the Ruins of Lordaeron.