Estes B4-4 Model Rocket Engines (3pk) - EST1602 GMA30085 NOTE: Lithium batteries require a

NOTE: Lithium batteries require a speed controller equipped with a low-voltage cutoff

Treal Hobby Promoto CNC Aluminum Crash Structure

The body is prepainted and also features clear windows

This protects the spring and shock shaft from debris

The RidgeLine half cage low-profile body combines performance and realism

Estes B4-4 Model Rocket Engines (3pk) - EST1602 GMA30085 NOTE: Lithium batteries require aThe 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.