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Estes Rocket motors B6-4 Pk24 Estes model rocket engine bulk packs are available in four total impulse ranges: 12A mini engine A B or C standard engines. These packs may be used for the rocket bulk packs or other Estes rockets. Whether you are launching rockets at school with students at a youth group activity or rocket club monthly launch Estes engine bulk packs are a must. Engine bulk packs come with all the rocket engine supplies you need to launch 24 rockets. Included are 24 rocket engines 30 model rocket igniters 24 reusable igniter plugs and 75 squares of recovery wadding. Use the C6-5 engine to launch these bulk pack rockets: Alpha III Generic E2X Alpha Viking and Wizard.