Sennheiser HMEC 250 - Headset for General Aviation - Pilot Headset - excellent speech transmission - Active noise cancelling, Talk-Through function
UFQ AV Mike 2 aviation headset microphone suit for Bose QC25,QC35 also can work with Sony or Sennheiser headphone good quality|headset radio|headset h350headset sale - AliExpress
Aviation Pilots Vintage Pair - 2 Sennheiser NoiseGard Headsets for sale online | eBay