Shure KSM 137 SL, Small Diaphragm Condenser Microphones, Optimized for acoustic instruments, Neutral and precise sound for stage and studio applications, Ideal for overhead, hi-hat, piano, choir and orchestra and acoustic stringed instruments, Ultra-thin, 2.5 micron, 24 karat gold-layered, low mass Mylar® diaphragm for superior transient response, gold-plated internal and external contacts, Polar pattern: cardioid, Frequency response: 20 Hz - 20 kHz, Sensitivity: -37 dBV / Pa, Switchable pad: 0 dB, -15 dB, -25 dB, SPL: 164 dB (with switched -25dB pad), Three-stage switchable low cut filter, 14 db (A) very low self noise for a small diaphragm condenser microphone, Robust housing, Weight: 100 g, Includes A137C plastic case, A26M stereo bar, 2x A100WS windshield and 2x A57F Microphone Mounts, Also available as pair: Art.#171884#@+@+*Optional accessories:*@+@+, A53M Shock-absorbing microphone holder Art:#138152#, A27M Swivel Microphone Adapter for two microphones Art.#210368#