The Neuman WS 100 Windscreen Black is a 90mm attachment for a Neuman KM 100 and Series 180. This item will reduce boom, wind and the sound of movement being picked up by the microphone. Typically, they are made out of open-cell polyurethane foam. These windscreens do not cause interfering resonances and do not influence the directional pattern. Only in the upper frequency range is the output level slightly attenuated.