not sure if it is authentic kolinsky [SEP] this kolinsky brush is worth trying out i like the long handle with slanted tip to help scrape off any side residue of polish or even acrylic powder before it drys for us beginners lol the size seems to be true notshort teeny tiny bristles the hair is soft but i do not feel it is pure kolinsky it is just not as soft or even high quality as my other truly true kolinskys from melodiesusie