Studio 49 KB/KBX F No6 Resonator Bar Contrabass resonator bars one unit, Tuned resonance chambers made of best pine, Accurate resonance chambers made of 12 mm solid pine with integrated handles, Harmonious overtone tuning, Selected Rosewood bars 90 x 20 mm to 60 x 20 mm, Available tones 6 to 12 are: F, F#, G, G#, A, Bb, B, Recommended mallets S 60