Estes B4-4 Mini Bulk Pack - 3 Packs of 3 for 9 Engines / Motors with Starters
Brand: Estes

This mini bulk pack provides 9 of the Estes B4-4 model engines which is suitable for use in rockets weighing roughly between 1 and 2 ounces which is typical of most rockets being 1 to 2 feet tall. Estes model rocket engines are the standard in the model rocket industry for easy to use and reliable propulsion for your model rockets.

All the engines you need for medium altitude model rocket flights
The best way to get B4-4 engines in bulk
Estes engines are the model rocket industry standard