1/4A3-3T Model Rocket Engines (4ea)
https://www.ludingtonhobbies.com/shop/est1502-1-4a3-3t-model-rocket-engines-4ea-27629
https://www.ludingtonhobbies.com/web/image/product.template/27629/image_1920?unique=3784c92
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Manufacturer's Part #: EST1502
