Natural 7542 Round Domed Size 12 has a brush head that measures about 36mm Diameter x 76mm Long. Natural Chungking hog bristle is sourced from Chungking, China and preserved in its natural color 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.