Free with super high density sponge with O ring which suit for Daxxd Clxxk, Avcxxm,AxA,Fxxo and ect on Very durable and strong shield cable, can use for many years without any problems Material similar with Kevlar inside the cable for long duration. This saves the pilot who flies both types of aircraft from having to own and carry two headsets. Adapt your helicopter headset U174/U to General Aviation headset with this simple adapter to fit a two-plug regulation .206 (PJ-068) inch microphone and .250 inch (PJ-055) fixed wing General Aviation headset plug arrangement. Please note this adapter is NOT a Low to High Impedance Adapter NOR a High to LOW Impedance Adapter. Aviation headset adapter helicopter headset with U174U plug to GA dual plugs PJ055 and PJ068 twin general aviation headset twin connectors.