B4-4 Engine

The Estes B4-4 is a mid-power 18 mm engine designed for rockets weighing under 3.5 ounces. With a 4-second delay and smooth performance, it's a great fit for entry-level and seasoned rocketeers alike.

Each retail pack includes 3 engines, 4 starters, and 4 plugs.

Includes:
- 3 B4-4 Engines
- 4 Starters
- 4 Starter Plugs