Zelfo is an ecological building material composed of water and cellulose plant fibers such as hemp, flax, sugar-cane and waste paper. To retain its truly sustainable reputation, Zelfo is not combined with resins or glues and achieves optimal biodegradability. The material is moldable and comparable to wood when finished, making it an ideal green material choice for furniture, toys, instruments, and more.
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A good reason not to use wood for didges is that around 20 million of them are made each year, currently from wood, and that level of harvest is unsustainable. While wood is a wonderful and often sustainable material, there are similar reasons for many other situations where wood - especially tropical hardwoods is currently used.
There are also cases where wood isn't a good match - e.g. where you want thin sheets with 3 axis of curvature, and many of the favored materials for those situations aren't exactly sustainable either (VOC's, toxics etc etc).
(disclaimer, I'm biased!)