ISABEY THE ORIGINAL SIBERIAN BLUE SQUIRREL QUILL MOP Isabey"s most famous watercolor brush.Handmade by master craftswomen who apprentice for 10 years it embodies French artisanal skill and tradition.Capable of unbelievably large and flawless washes, with a delicate point for unique brush strokes and line work.Siberian blue squirrel hair is the finest with the most hairs per square inch, holding the highest volume of water possible.Genuine hand tied goose quill ferrule.