This is a cover for the opposite side of the boom on a Bose Triport Tactical headset See my Headsets and parts that I have for sale at my eBay Store http://stores.ebay.com/KC-Headsets About KC HeadsetsKC Headsets is a pilot-owned and family operated aviation Headset Repair station and retailer based in the Kansas City Missouri area. We focus on bringing affordable repair services, aviation headsets and accessories to the aviation community. Visit our website to learn more.