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Estes D12-3 model rocket engines are designed for use with compatible Estes rockets requiring a standard D-class motor. The D12-3 designation indicates the engine class, average thrust in Newtons, and a 3-second delay before ejection charge ignition. This pack includes 2 engines, 2 igniters, and 4 plugs. Labeled as flammable, these should be stored and handled according to NAR safety guidelines.