Escoda Clasico 4729 Oil & Acrylic Chungking White Bristle Paint Brush Filbert; Size 4 Clasico 4729 Filbert Size 4 has a brush head that measures about 3.87mm Wide x 13mm Long Chungking hog bristle (bleached white) is sourced from Chungking, China and traditionally used in oil painting and is well known for its natural hardness that responds perfectly to various oil & acrylic paint densities and to a variety of painting techniques Escoda brushes boast trademarked tripled crimped ferrule ensuring a lifetime secure fit, unique curing process that locks each hair in place creating a permanent brush shape and all wooden handles are ergonomially designed and made from the finest brich wood available Escoda's ISO 9001/100 Cerification ensures that each brush is engineered and hand crafted to exacting standards and is supported by Escoda's Lifetime Guarantee against workmanship defect if purchased from an authorized dealer Since fine art brushes are hand crafted, please expect some variation to the listed dimensions