They are dimensionally optimized, stable against cracks and have thin walls Have the warm sound of a wooden didgeridoo This Didgeridoo made of baked wood combines the advantages of both, wood and fiberglass With thin walls but stable compared with the warmth of wood, optimized shape for overtone, classical and percussive play 2" mouth, 6.5" big bell end Toned in Cis. D. E .F. "Baked wood“ is a mixture of wood chips and bone glue. This mixture is applied to a form optimized fiberglass frame and then baked in an oven.