Clasico 5337 Fan Size 4 has a brush head that measures about 10.01mm Wide x 27mm 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