B'Dynn's Sash of Speed
Basically Flowing Black Silk Sash 2.0, it drops from Dorn B'Dynn who is spawned for the quest "Of Fate and Destiny" - Part of the Ring of Fate (equipment) Series.
5agi 5str and more haste (22%) than the FBSS.
Hope you have a lot of time... This quest series when finished will give you the Hero of Maj Duul title.