3M PELTOR Replacement Flexible Dynamic Boom Microphone - MT33-05R. This noise cancelling mic is primarily used on 3M PELTOR Comtactwo-way tactical communication headsets, but is also compatable on other select Peltor branded headsetsThe 3M PELTOR Brand is a respected global leader in hearing protection and communication solutions. With production facilities in several countries including the US, 3M PELTOR supplies both traditional over the ear and innovative in-ear solutions to industry worldwide as well as elite tactical military teams and law enforcement. The PELTOR brand is built tough for the working professional.