This is a 0.1mm ultra-slim brush optimized for the winged eyeliner. This is a 0.1mm ultrafine brush that is drawn to the wing of the eye. Draw smoothly & sleekly to the end of your eye with a thin brush type without irritation. Draw the eyeliner freely with adjustable thicknesses from a skinny line to a bold line using a flexible brush type. Even if you blink it is quickly fixed without any smudging.