A good brush is characterized by four virtues: "Sharpness," "Evenness," "Roundness," and "Strength."
"Sharpness": The brush tip is sharp, pointed, and well-formed.
"Evenness": The brush tip is neatly and evenly shaped.
"Roundness": The entire brush head is a well-formed cone shape without any splits.
"Strength": It is durable, strong, flexible, and resilient.
Namura Taiseido's calligraphy brushes are handcrafted one by one by artisans to possess these four virtues.
Precautions after use: To prevent ink buildup at the base and rotting, and to prevent the bristles from breaking, rinse the brush head with water, gently rubbing it with your hands to remove any ink.
(From Amazon.co.jp)
Brush diameter: 8.5mm
Brush length: 32.0mm
Main material of brush tip: Weasel hair
Shaft material/appearance: (Black) Plastic, Daruma
Hardness classification: Hard