- For Double Bass Metallophone GBMP1.1 - Primary Line Series - 7 tones: C#, D#, G#, C#1, D#1, G#1, B1 - Overtone tuning up to A - Fundamental tuning from B - Silver, special alloy metal sound bars: 35 x 10 mm - Resonator box made of barred birch wood - FSC-Certified EUR 829.00 - See more - Buy online