The upgraded SIRE acoustic guitar is brimming with design and features meeting the quality standard of Larry Carlton. The A4 has two body shapes - Dreadnought and Grand Auditorium. More than the comfort from the rolled fretboard edges, the added solid Mahogany back plate makes the acoustic guitar more worth than its value. The solid wood materials used from top, a Roasted Spruce, to bottom, a solid Mahogany, in the SIRE A4 promise durability, power, and stability added in the guitar's overall acoustic profile. The accompanying Rosewood fingerboard with rolled fretboard edges surely makes the playing comfortable. The overall sound enhanced by the installed SIRE SIB Acoustic EQ system is approved by Larry Carlton.