Found some info on them...
CM-10/CM-10C/CM-10Q instrument condenser microphone series adopts 16 high quality
headgrille and electric circuit .It has high sensitivity and low self noise, it also has three directionals such as cardioid, omni and super directional ,CM-10 microphone series can be widely used to pickup of orchestra instrument and piano and so on.Element: 16 back electret condenser Polar Pattern: Uni/Super/Omni-directional Frequency Response: 30Hz-18kHz Sensitivity: -38dB±3dB (0dB=1V/Pa at 1kHz) Output impedance: 100Ω±30% (at 1 kHz) Self Noise: 24dB A Max. Input SPL: 135dB (at 1kHz ≤1% T.H.D) S/N Ration: 70dB Phantom Power Requirement: 9-52V Phantom Power