Sonor Primary chromatic add-on for rosewood alto xylophone. This extra resonator box comes with 7 bars and also has extra space to hold the F# and Bb bars from your diatonic instrument.; Included bars: Sharp: c1, d1, g1, c2, d2, g2 Flat: b2 **Mallets not included.** Primary xylophones support music reading.; The bars with the print of the note enable a visual connection between the sheet music and the instrument. All Primary xylophones have 35 x 18 mm Pao Rosa sound bars with overtone or fundamental tuning.; The redesigned stepped resonator boxes are made of solid birch plywood to prevent warping. The sound bars and resonator boxes of Sonor Primary xylophones are FSC certified, which means only timber from well managed forests are being used.; In addition an environmentally safe finish is used, based on shellac, oil and carnauba wax.