This useful file is for smoothing out the depression in which to set the string and rattan.
Size Withd 6mm, Made in Japan
Mentori 2-rin (width:0.7mm), ¥13500
Celluloid Sheet (Tortoiseshell Pattern, Thin) - Material for Making Shakuhachi Joint Rings, ¥800
Wooden Joint Section Insert L, ¥1000