Smith Cosmetics 220 Eyeshadow Finishing Brush is a brush that retails for $24.00.
Smith Cosmetics 220 Eyeshadow Finishing Brush ($24.00) is a medium, rectangular eyeshadow brush with a flat edge and very faint flaring from the ferrule. It is made out of synthetic mongoose hair, and it is designed to be used with powder products for blending and buffing eyeshadow out. The brush has a total length of 6.90 inches / 17.50 centimeters, and the brush head was in 16.00mm width, 12.00mm length, and 4.00mm thickness (at its widest/longest points). This was one of the brushes I was most curious about as I have not personally used a brush like it for makeup. It's incredibly soft and smooth with a denser base that gets less dense and has most of its flexibility towards the edge (right where the brush hairs become a darker brown). I liked it for blowing out eyeshadow on the lower lash line, as it fits well but gives a really diffused edge with little work. It also worked in place of a traditional blending brush, particularly for areas like the crease, transition, and above the crease to pull and diffuse color towards the brow bone.
Synthetic mongoose hair makes this brush soft but firm, allowing you to blend and buff shadow for a flawless finished look.