Giannini GVSC4 Handcrafted Series Brazilian Viola (Acoustic, 10-String) Handcrafted all-solid acoustic 10-string, steel, Brazilian Viola. Solid Sitka Spruce top, solid Mahogany back and sides, Ebony fingerboard. Gold plated machine heads and reinforced neck with adjustable truss rod. Supplied with Giannini hard case.