Brush, Regular #4, Kasan Hair. Made from the prized hair of the Siberian Kasan squirrel, these are the finest quality brushes available for porcelain painting. They are made in France using techniques from the early 1900's. Each quill is hand tied and made with only the finest tips of the Kasan hair. The fine hairs are excellent to hold paint and oil and give a very consistent result. With proper care, these will last for many years.