The top is Sitka Spruce, The back and sides are Indian Rosewood, and the bridge and fingerboard are Ebony. I've made a variety of baritone guitars, each with a different scale. Even though the longest of baritone scales ( 30" ) gives the most resonant basses, it's often shortened a little bit to make the guitar easier to play and help the player's posture. This particular guitar's X bracing pattern was laid out to emphasize the mid range necessary to even out the peaks of the low and upper registers of the baritone soundscape. The instrument is amplified with an under the saddle pickup system, often augmented with an outside microphone.