Wikipedia
A xaphoon (pronounced "za-foon"), is a chromatic "Bamboo Sax" or single-reed instrument/ woodwind instrument. It has a straight cylindrical tube with cylindrical bore and a very slightly flared bell. The xaphoon plays a fully chromatic scale somewhat beyond two octaves, and overblows at the 12th, like a clarinet. The first xaphoon, made out of bamboo in 1972, was a spontaneous effort by Brian Wittman (a Hawaiian saxophonist and multi-instrumentalist) to create an instrument for a young child who liked the sound of the saxophone. Wittman was impressed by the sound of the simple instrument and by demand started to manufacture and sell it.
The design of the xaphoon is patented.
The range of the xaphoon happens to be comparable to the chalumeau, a European keyless single-reed instrument that was the ancestor of the clarinet; therefore the Xaphoon can be used to play written chalumeau music, as well as music in any other style associated with the saxophone or clarinet. In addition to the chalumeau, similar instruments bearing other names exist in other regions. These include the Heping Flute 和平笛 and the Ebi (from Yunnan), both of which use the design of putting a single reed on a Dongxiao, a vertical flute. Other variations include various bamboo/pocket/mini saxes that include an actual saxophone mouthpiece (sometimes connected at a curve.)
Due to its abbreviated length and large finger-hole size, the pitch of individual notes can be raised and lowered easily, making the xaphoon equally well-suited to play Turkish, Middle Eastern, and other musical scales outside the European tradition. The xaphoon has been made commercially available by Brian Wittman since 1975; Wittman still makes approximately 1500 bamboo instruments per year by hand at his home on the island of Maui, Hawaii, using local bamboo selected from the forests of the eastern end of the island.