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Rockets B6-4 Model Rocket Engines 3pk made by Estes . The Estes B6-4 engine is a versatile and dependable choice for launching standard-size model rockets. Designed for rockets weighing less than 4.0 ounces, it provides a solid boost with a 4-second delay for smooth parachute deployment. . Ideal for beginner to intermediate rocketeers, the B6-4 delivers a balanced combination of altitude and recovery timingperfect for educational launches, club events, or weekend flights. .