Martin GPC-Aura GT Construction: Ply Blocks/Simple Dovetail Neck Joint Body Size: GPC-14 Fret Cutaway Top: Solid Sitka Spruce Rosette: Two Ring - Fiber with Pearl Top Bracing Pattern: Hybrid ''X'' Scalloped Top Braces: Solid Sitka Spruce 5/16 in. Back Material: Solid East Indian Rosewood Back Purfling: Style 45 Side Material: Solid East Indian Rosewood Endpiece: none Endpiece Inlay: none Binding: White Boltaron Top Inlay Style: Black/White/Black Boltaron Side Inlay: Black/Whi Introduced at the 2014 Musikmesse in Frankfurt, Germany, the Special Edition GPC-Aura GT Grand Performance Acoustic-Electric Guitar comes equipped with Fishman F1 Aura Plus electronics and consists of an East Indian rosewood body with a satin finish and a polished gloss Sitka spruce top featuring a two-ring pearl rosette Added features include a certified African blackwood bridge and fingerboard, with hexagon pearl inlays The nickel ratio tuners with skeleton knobs allow each string to have its own gear ratio The skeleton button adds a jewel-like appearance and lessens the weight of the tuners