The DPA DUA6017 is a 5 peice kit of soft boost grids that provide a 3dB soft boost around 8 - 20kHz when mounted onto 4060 Series Lavalier and 4066/4266 Headset miniature series microphones. The grid compensates for frequencies lost when placing the microphone around the head of the performer. The metal grid is anodized stainless steel.