Modernista 4075 Round Size 20 has a brush head that measures about 14.1mm Diameter x 42mm Long. Tadami is the synthetic version of mongoose hair, imitates its natural appearance and feel, offers good spring and an immediate response to the brushstroke, especially with acrylic and oil painting. 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.