The Howard Leight Smart Fit metal detectable earplug is both reusableable and economical. The Smart Fit Earplug delivers superior comfort and a truly individual fit. This single earplug will fit almost every wearer reducing inventory control. The bright blue color makes them easily detected. The detectable ring on the stem and metalized cord are detectable by automated equipment keeping contamination from occurring. NRR 25 dB. SNR 30dB, Conforming Material Technology, Reusable and economical , Bright blue color for extra visibility in food processing environments , Both cord and plug are metal detectable , Each pair supplied in poly propylene case