Thread - Brown Uni Thread 8/0
Hook - Tiemco 2457 or Equivalent. Size 12-20
Tail - Pheasant Tail Fibers 
Body - Pheasant Tail Fibers
Rib - Copper Wire
Thorax - Gray Dubbing (Hareline Dubbing - Adams Gray)
Hackle - Dun Hen Neck

Fly's story....

This is a great imitation for an emerging Blue Winged Olive.  I fish it as a dropper on a double nymph rig, on the swing as a traditional soft hackle or with a greased leader to rising fish.  If you want another option, change the dubbing to yellow and you'll have a Sulphur emerger.