The Estes D12-0 engine is a booster stage engine designed for model rocket flight and has to be used with a standard engine. This engine is for flights in rockets weighing less than 14 ounces, including the engines. Each package includes 2 engines, 2 starters and 4 starter plugs.
WARNING
001565
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These are 70mm long and 24mm diameter
Answered by: Ben @ Wheelspin Models