Chikuhodo Z-1 Powder Brush is a brush that retails for $226.00.
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Z-1 Powder Brush ($226.00) is a large, rounded, slightly tapered brush. It is one of the larger brushes I've come across and have in my brush treasure trove. The brush is made out of gray squirrel hair, and the brush head is 45mm in length, 35mm in width, and 35mm in thickness. It had a total length of just over 6 inches or 16 centimeters with an open ferrule. The lightly rounded, large edge makes blending powder products a breeze. I used this a lot like a kabuki brush but with a longer handle; it does a fantastic job of just finishing and setting everything into place. To that end, it also works well with finishing and setting powders, and even powder foundation (which I only tried a few times just to see how it performed). I really liked applying all-over highlighting powders with this (think Hourglass Ambient Lighting Powders or Guerlain Meteorites, the latter was particularly lovely with this, as the brush fits well into the container). It's incredibly soft and feels nice against the skin, but it is very effective.
MAC 138 ($53.00) is slightly skinnier and much more tapered. This was the only comparable brush I could think of, aside from the Z-9 below (which is not really the same shape but more similar than not).