Sonor Global Beat Soprano and Alto Xylohones have 35 x 18 mm sucupira sound bars with overtone tuning or fundamental tuning. Their resonator boxes are made of birch plywood. Sonor equips the Global Beat Xylophone with a carrying bag to stow 3 bars (2x f-sharp, 1 x b-flat).Bars are made from a South American Hardwood from Brazil called "Sucupira" Tuned to A 440 Added Features: mallet storage, chromatic bar bag, flexible rubber pins, note name stamped in the middle of the bars & inside each resonator chamber Each 16-bar diatonic xylophone includes one Bb & two F# bars plus one pair of mallets