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AeroTech 6109 Q-Jet Black Max Composite Model Rocket Motor - A3-6FJ 2 Pack (Ships USPS Ground) 4-Tec 2.0 Lionel 6-81951 O Gauge O60AeroTech 6109 Q Jet Black Max Composite Model Rocket Motor A3 6FJ 2 Pack Ships USPS Ground The Q Jets are the world's most advanced 18mm model rocket motors. They utilize a patent pending high strength polymer case and bulkhead, ceramic nozzle and RCSs exclusive Black Max aerospace grade composite propellant formulation, which produces nearly double the specific impulse (or "Isp", a propellant efficiency rating) of conventional black powder