Superjumbo 21-SW series Cutaway acoustic guitar, with NEW CNR (Composite Neck Reinforcement) system included, incorporates a composite reinforcement, which improves neck durability and extends the lifespan of the guitar as a whole. sn: 74096. Solid spruce top, solid walnut back and sides with open pore finish, mahogany neck, rosewood fingerboard and bridge, Furch chrome tuners, Gig bag included. The Spruce top has more opened sound with excellent brightness compared to cedar top. After the guitar had been played, the spruce will have more loudness in the middles. Walnut produces warm and tight bass, its sound is between mahogany and rosewood. It produces tight bass with nice bright sound.