3M Diamond Grade 989 72 2X50 ~ Reflectors 989 72 Red (2 Inch x 3.5 Inch) 7000129483 Application_Equipment Maintenance The 3M E A Rfit Dual Ear Microphone Length_29cm The 3M E A Rfit Dual Ear Microphone Assembly works with the 3M E A Rfit Dual Ear Validation System to help employers determine whether workers are receiving adequate hearing protection from their hearing protector Weight: 58 lb Brand 3M Line Diamond Grade Adhesive Type Pressure sensitive Color Red Length 3 1 2 Inch Width 2 Inch Origin Country USA Product Type Safety Tapes 3M Diamond Grade Reflectors Series 989 are microprismatic retroreflectors designed to offer improved visibility and detection on the roads