The Estes B6-4 engine is single stage engine designed for model rocket flight. This engine is a standard engine designed for flights in rockets weighing less than 4 ounces, including the engine. Each package includes 3 engines, 4 starters and 4 plugs.
| Style | Box |
| Seasons | All Seasons |
| Theme | Vehicle |
| Size | Medium |
| Number of Pieces | 3 |
| Item Weight | 9 Pounds |
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