Material similar with Kevlar inside the cable for long duration. Very durable and strong shield cable, can use for many years without any problems. This saves the pilot who flies both types of aircraft from having to own and carry two headsets. Free with super high density sponge with O ring which suit for Daxxd Clxxk, Avcxxm,AxA,Fxxo and ect on. General Aviation to Helicopter Headset adapter Adapt your General Aviation headset to a Helicopter with this simple adapter Features 3/16" mic jack and 1/4" speaker jack to Nexus 4 conductor U174U.