Soft hair (軟毫): Goat hair (羊毫) — most common, absorbs ink generously, flexible but does not spring back to shape, producing rounder, less controlled — and to many painters, more interesting — marks
Stiff hair (硬毫): Weasel tail hair (狼毫, literally "wolf hair" though no actual wolf is used — a translation confusion going back centuries), rabbit spine hair (紫毫), all firmer and more elastic than goat
Compound brush (兼毫): stiff hair at the core ("pillar") wrapped in soft hair ("robe") — named by their exact mixing ratio, e.g. 三紫七羊 (three rabbit, seven goat) or 五紫五羊 (equal parts) — a single brush engineered to a precise point on the soft–stiff spectrum
Rare/ceremonial hair: rat whisker brushes (鼠須筆) — reputedly the brush Wang Xizhi used to write the Lantingji Xu (蘭亭集序), one of the most revered works in Chinese calligraphy; baby's first-hair brushes (胎毫筆) — made from an infant's first haircut as a birth keepsake, not a working tool
Handle: bamboo, with luxury versions in jade, ivory, or lacquered wood
Regional production centres: Huzhou brush (湖筆, Zhejiang) and Xuan brush (宣筆, Anhui) carry the same prestige as a wine appellation — the origin itself signals quality