Available woods are Indian Rosewood and Ebony as well as Black Locust, Plum, Apple and others for Local Wood instruments. There are different kinds of bridges for classical and acoustic guitars. The classical bridge we use also for the classic bass and the ukuleles. The Legendary Acoustic Bass and the IQ-Bass have separated tailpiece and bridge. The shape can also be influenced. But this has to be done very cautiously. The shape of the bridge affects the tone, just like the inner bracing of the top.