Precision casting, alloy copper. A set of 36 notes, different pitches can be selected separately (other pitches can also be customized), and a gong stand can be selected as an option. C3C#3D3D#3E3F3F#3G3G#3A3A#3B3C4C#4D4D#4E4F4F#4G4|G#4A4A#4B4C5C#5D5D#5E5F5F#5G5G#5A5A#5 "B5.