Estes B4-4 Engines/3pk 1602

This is one B4-4 Model Rocket Engines (3pk) by Estes Rockets. Please note in store availability and pricing may vary. The Estes B4-4 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, 4 starters, and 4 plugs.