The Dynasty Concert Marimba is 4.3 octaves (low A) with synthetic bars. This great instrument has been field tested with many DCI corps and is designed and tuned for outdoor work. It is tuned to A442 with stretch tuning for projection and brilliance. Included is the Dynasty Power Cart which includes a heavy duty accessory bar on the front of the instrument. The bottom line is that this instrument is heavy duty and has great sound and projection.