The Estes B6-4 Rocket Engine 3-Pack is a medium engine pack that delivers high altitude flights. As a standard 18mm single-stage engine, this is designed for larger, heavier rockets.
Estes 1606 B6-4 Engine Bulk Pack package includes -
3 B6-4 Engines
4 starters 
4 starter plugs
B6-4 Rocket Engine 3-Pack is best used in the rocket kits below -
0651 Der Red Max
1225 Alpha
1256 Alpha III
1261 Baby Bertha
1292 Wizard
1329 Multi-Roc
1946 Boosted Bertha
1948 Big Bertha
1949 Viking
2008 Generic E2X
2021 Cadet
2056 US Army Patriot
2092 Mongoose
2113 Starbase
2126 Tech-Pak
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