Pino Kena's features: The bamboo is burned on the inside, a process that no Japanese kena maker has mastered, to prevent insect damage and pitch changes over time. This process was learned at a kena workshop in Peru. Product Information: A notch has been added to the thumb position for a non-slip grip. Material: Peruvian bamboo Total Length: 38cm Outer Diameter: 29mm Inner Diameter: 18.5mm Thickness: 5mm Mouthpiece Width: 11mm Mouthpiece Depth: 9mm Maximum Hole Diameter: 12mm Weight: 90g Pitch: 442hz (Individual variation possible) ✳️ Kena workshop Pino does not sell on other sites.