Kena Workshop Kaze Kobo. This is an F-pipe kena made from the popular South Kyushu-grown Houraichiku bamboo. Total length: 419 mm, outer diameter near the mouthpiece: 28.3 mm, inner diameter: 20.5 mm, finger hole diameter (max): approximately 11.5 mm. Mouthpiece width: 10 mm, depth: 7.6 mm. The pitch is around A=442-443 in my workshop at a room temperature of 27 degrees Celsius, using my blowing technique, but it varies greatly depending on how you use your breath. Please understand that there will naturally be individual differences. There may be scratches, stains inside the pipe, and slight warping that cannot be completely corrected, which are characteristic of natural materials. This is a masterpiece that resonates comfortably from the low notes with rich overtones to three octaves.