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Shure's very popular A55M Shock Stopper ^TM isolation mount reduces transmission of mechanical noise and vibration by more than 20 decibels. Helps to combat low frequency rumble and noise like footsteps from getting into the microphone body. Compatible with models SM57, SM58^®, Beta 58A^®, or any Shure microphone with a tapered handle. Surrounds your microphone with a balloon like insulation mount. Your microphone literally floats on air. List Price: $50.01