Soprano/Alto Xylophones KB/SX Soprano resonator bar, bar made of Rosewood, c2 - a2 KB/SXG Soprano resonator bar, bar made of GRILLODUR, c2 - a2 KB/AX Alto resonator bar, bar made of Rosewood, c1 - b1 KB/AXG Alto resonator bar, bar made of GRILLODUR, c1 - b1