The pictures shown here are different styles of mouthpieces that I use for the flutes. I use the Xiao style mouthpiece the most because it produces the easiest sound. The NangXiao style is constructed with the mouthpiece partially closed like the Xiao, depending on the bore diameter. The Shakuhachi style has a typical 30% angle cut which is not easy to play but with practice it is not impossible. Most of them has a minor pentatonic scale. The pentatonic scale is an ancient music scale from China and the Shakuhachi is descended from the Chinese as well. Shakuhachi means "one shaku eight sun" (1'.8") which is the original length for this flute and is in the key of D. The Xiao was introduced to Japan from China in the 6th century. The majority of these styles of flutes are made from aged bamboo. Please contact me with any questions or concerns.