- Head: East Indian rosewood
- Mechanical: open, nickel finish, Butterbean buttons
- Head nut: bone, 44.4 mm
- Neck: selected wood, dark mahogany finish
- Handle finish: satin varnish
- Neck profile: Modified Low Oval, High Performance collar
- Fingerboard: ebony
- Number of frets: 20
- Body type: Dreadnought, body / neck junction at the 14th fret
- Body / handle junction: glued, assembled in dovetail
- Scale: 645 mm
- Table: Sitka spruce
- Table finish: glossy varnish
- Table fillet: Bold Herringbone
- Rosette: multiple bands
- Table dams: Sitka spruce
- Type of table dams: X, Forward Shifted, indented
- Back: East Indian rosewood
- Fishplates: East Indian rosewood
- Back & Sides finish: glossy varnish
- Bridge: ebony
- Bridge nut: bone compensated, 406 mm
- Pickguard: False Tortoise
- Strings: SP Acoustic 92/8 Phosphor Bronze Medium (SP4200)
- Case: molded
Brand reference number:
GMA HD-28
en 
