Lift Noise Control Slotted Works W/Radix & BriggsOur noise control hearing protection passively blocks noise by relying on the insulating materials of the ear cups to dampen sound. The dielectric construction makes them safe for all environments including electrical applications. Comfortable cups and low pressure make them comfortable for all day wear. 25 dB Passive noise reduction rating Spring design offers low pressure and a high level of comfort Three distinct wearing positions for ease of use