Auris 12-Tone Diatonic Xylophone Auris' xylophone frames are manufactured from birch wood ecologically harvested in Sweden. The tones are made from Rubinia (also known as Acacia), ecologically harvested in Hungary. Perfect for both the practicing musician and the student. The tones are made from Rubinia (also known as Acacia), ecologically harvested in Hungary. Perfect for both the practicing musician and the student.