The Estes Solid Fuel Rocket Engine B6-4, Pack of 3 are single stage engines (green label) that come in a three pack. Some of the Estes rockets that use "A" engines for launching include the Alpha, Code Red and Wizard. We are unable to ship the rocket engines through the post so these are only available in store.Manufacturer: EstesModel: 1606 Estes Solid Fuel Rocket Engine B6-4, Pack of 3
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