Kolinsky brush – 100 % pure Kolinsky hair – made in Russia . 100 % pure, clean Kolinsky natural hair. It can be used for painting with acrylic paint, watercolors, classic painting , blending etc. This is one of the basic brushes for painting . Number 2 is thicker , it is not used for extremely thin lines , it is using for blending and painting. Special GOLD edition – made for Gel paint and Gel Polish art.