Shadow Aero sells ultra high level rocket materials, parts, and custom rockets. They used to sell kits, but these kits are no longer made and they sold out. Their work is at the top of hobby rocketry.
This is a two stage "Shock X2" which is basically a two stage copy of the Shock kit (a ultra high performance, high cost kit). As you see it here, this rocket can fly to a reported 50,000 feet and attain more than mach 3.5 using two L motors. Needless to say, for a rocket this size, that type of performance is insane. Perfect rockets for kosdon thin motors (motors one dia thinner than the typical aerotech motors, for example a 54 mm L or 38mm full J).