Sonia G Mini Base (Keyaki) is a brush.
Sonia G Mini Base (Keyaki) ($125.00) is a small, buffer-shaped brush with a subtle, domed edge with a fair amount of density and light spring. It is made out of white sokoho goat and synthetic fibers (Nylon and PBT), as it was designed to work with creams, liquids, and powders. The bristles were smooth and soft when in use, and they moved fluidly across the skin without losing any bristles.
It works well for smoothing and buffing products on the skin, whether that's for foundation, blush, or liquid highlighter. It is a very small brush head--relative to most face brushes--so for those who want a very quick application over a larger area, like for foundation, it may feel too small. I found I reached for it more for buffing out the edges of blush application and to soften the edges of under eye concealer the most.