Cordoba LUTHIER GK Pro Negra Nylon-String Classical Guitar - SprucePlay Like a Gipsy King! The Cordoba GK Pro Negra Gipsy Kings signature model nylon string acoustic guitar combines a fast playing feel with traditional flamenco construction techniques for a remarkable playing experience. The GK Pro Negra is built for tone, with solid Indian rosewood back and sides with a solid European spruce top. The mahogany neck is slightly thinner and narrower than traditional classical guitars for smooth playability. And the