The Estes B4-4 engine is single stage engine designed for model rocket flight. This engine is a standard engine designed for flights in rockets weighing less than 3.5 ounces, including the engine. Each package includes 3 engines, 3 igniters, and 4 igniter plugs.
- 3 – B4-4 Engines
- 3 – Igniters
- 4 – Igniter Plugs