Replacement, high-quality new Shure SM-58A microphone core - According to user reviews, 100% original quality reproduction. Technical data: Model: SM-58A Style: dynamic Impedance: 600 (± 15%) Sensitivity: -56 (± 3dB) (at 1KHz) (0Db = 1V / Pa) Frequency response: 80Hz-15KHz, Height: about 42mm