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.