Estes 1602PK2 B4-4 Model Rocket Engines, 6 Count – 18mm Single-Stage Motors with Starters & Plugs Shielded to protect against external

Shielded to protect against external signal interference

Robotic Ride

Battery life is long as the energy efficient lights have low power consumption

High leverage design for heavy duty usage

Estes 1602PK2 B4-4 Model Rocket Engines, 6 Count – 18mm Single-Stage Motors with Starters & Plugs Shielded to protect against externalPLEASE NOTE: These are 18mm diameter engines. Please refer to the instructions that came with your rocket (or the rocket's product description) to determine engine compatibility. 2 Packs of Estes B4 4 engines total of 6 engines (each pack includes 3 engines, 4 starters, and 4 starter plugs) The B4 4 is a single stage engine designed for model rocket flights weighing less than 3. 5 ounces, including the engine Recommended for use with the Baby Bertha,