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Estes B4-2 model rocket engines come in a pack of three and are designed for use in compatible model rockets. The B4-2 designation indicates a B-class motor with a 2-second delay, making it suited for lighter rockets requiring a brief coast phase before ejection. Each pack also includes igniters and plugs for launch readiness. These are a standard Estes factory motor suitable for sport flying and beginner to intermediate rocketry.