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 Lower Flange" is the one that you put velcro on. (Velcro not included). It is a smooth fit but not too tight in order to preserve the cloth material. The price is for one part. If you need both pilot and copilot side then order two. It has a good sturdy base.