Sonia G Jumbo Blender (Keyaki) is a brush.
Sonia G Jumbo Blender (Keyaki) ($125.00) is a large, moderately-dense eye brush with a more tapered and rounded edge that is designed to blend out products. The brand also noted it could be used as a "crease brush" if used sideways. It's a particularly useful brush for all-over blending and finishing or to apply more of a one-and-done shade all over the eye area. It was smooth, fluid, and comfortable to use in any direction or motion. Thus far, the undyed version seemed to fluff up less after a few washes compared to the dyed version, though it didn't really make an impact in the application.
You can read my original review of the Jumbo Blender.