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The Estes B6-6 is a standard model rocket engine designed for use in compatible Estes rockets. The B6-6 designation indicates a B-class engine with 6 Newton-seconds of average thrust and a 6-second ejection delay. This package includes 3 engines along with igniters and plugs to get you flying. It carries a flammable materials warning and is intended for model rocketry use by hobbyists following proper safety guidelines.