In connection with the F-22 Raptor, its EPR is considered to be 0.0001 square meters. So one square centimeter! Imagine a behemoth weighing almost 20 tons, with a length and wingspan of 19 and 13 meters or 62 and 42 feet respectively. And on the radar, it looks smaller than a tie cufflink in a business dress code! A very low-observable target indeed! This is achieved, first, by the active use of new composite materials based on bismaleimides - a class of heat-resistant polymers that work at temperatures up to 230 degrees Celsius and that are not visible on radar.