Conforming Material Technology adapts to the shape of the surrounding ear canal when in your ear, and returns the earplug to its original shape when removed. Delivers superior comfort and a truly individual fit. Simplifies inventory control – a single product can fit almost every wearer. Blue color provides high visibility in detection. Metal ring on stem detectable by automated equipment. Corded/Cordless: Corded; Shape: Flanged; Materials: CMT Polymer; Noise Reduction Rate NRR: 25 dB.