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.