The microphones in the MXL FR-355K kit were designed with high quality FET pre-amps to ensure outstanding audio quality even under the most demanding conditions. The FR-355K kit contains 2 different microphones. The FR-351 cardoid mic has a 8mm capsule, while the FR-350 omni mic has a 6mm capsule. These lavalier microphones require 48v phantom power to operate. They are both supplied with foam windscreens and clips.