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They range from 20 - 23 cm long for 0.4 or 0.5 to 0.51 (Japanese) blowguns. Would need to be proportionately longer for 0.625 cal. Can be custom sized for non-standard internal diameter (carbon fiber, PVC, brass, iron, steel, glass, etc.) tubes.
The International Fukiyado Association (and affiliated national organizations) requires this knowledge for certified instructors (Sensei) in the sport.
The International Fukiyado Association (and affiliated national organizations) requires this knowledge for certified instructors (Sensei) in the sport.