The bristle width on these synthetic hair brushes match that of the Le Petite Unicorn Horn Brush. These come with a longer handle and a rounded brush shape.
Individual brushes may vary ever so slightly as these are a hand made product.
TIP: These can be used as a cleanup brush for nails, eyebrow brush, eyeliner brush, etc. Of course this is as long as you dedicate that brush to that purpose.
To extend the life of your brush be sure to clean it with acetone between uses. Do not leave the brush sitting in acetone even for short periods of time. Acetone Antidote may extend the life of the brush due to the conditioning elements of the additive.
Thanks to @nailbastion for the beautiful photo!