Brilliantly colored plugs feature a nonferrous metal grommet ensuring excellent visual and metal-scan detectability making the Laser Trak line particularly useful in process industries employing automated inspection technology. Low-pressure polyurethane foam gently expands to fit the wearer s ear canal. Contoured T shape simplifies insertion and removal. Corded/Cordless: Corded; Shape: T; Material(s): Polyurethane Foam; Brass; Noise Reduction Rate (NRR): 32 dB.