BrowZings by Benefit Cosmetics is my absolute favorite. The kit includes brow powder and wax, as well as two brushes (an angle and a blending) as well as mini tweezers.
The kit comes in three colors: light, medium, and dark. My favorite way to use it is to dip the angle brush in the wax then powder, and then outline the brow shape. I then lightly fill in the brow. Last, I take the blending brush and blend the powder in by brushing backwards to make it look more natural.
BrowZings last forever, and are great quality.