Dragonspine Trophy

Dragonspine Trophy is an epic trinket for physical DPS classes. The trinket grants the user +40 Attack Power and has a Chance on Hit to grant 325 haste rating (30.91%) for 10 seconds, and has a fairly high chance to proc. This item is best fitted for rogues, hunters, fury warriors and enhancement shamans. The haste rating also speeds physical skills, slam for example has its delay and cooldown reduced to 0.35 after haste is added.

Source
This item drops from Gruul the Dragonkiller in Gruul's Lair.