This product is a detachable ebony brush replacement head (not including the barrel)
Replacement head in large case, caliber: 8mm
Replacement head in regular letters, caliber: 7mm
Lower case replacement head, caliber: 6mm
Wool: Jian Hao (Wolf Hao, Sheep Hao)
Pen factory: Lin Sanyi's pen and ink expert
Replacement head in large case, caliber: 8mm
Replacement head in regular letters, caliber: 7mm
Lower case replacement head, caliber: 6mm
Wool: Jian Hao (Wolf Hao, Sheep Hao)
Pen factory: Lin Sanyi's pen and ink expert