A mount to secure headset control module. Plastic material type is ASA that is UV resistant and NOT biodegradeable PLA like some others. For type, flange is the one with screw locators on each side and no flange is the one that you put velcro on. (Velcro not included). The price is for one part. If you need both pilot and copilot side then order two. It has a good sturdy base.