The Estes B4-4 is a reliable, single-stage 18 mm engine designed for model rockets weighing under 3.5 ounces. With a balanced 4-second delay, it's a perfect fit for smooth, stable flights and consistent recovery deployment.

Each 3-pack includes three engines, four starters, and four starter plugs; everything you need for several successful launches. Ideal for hobbyists and STEM projects alike, the B4-4 delivers steady performance with every flight.

Includes:

3 × B4-4 Engines

4 × Starters

4 × Starter Plugs

PLEASE NOTE: You must have a physical address for delivery.