Estes D12-3 Mini Bulk Pack - 3 Packs of 2 for 6 Engines / Motors with Starters
Brand: Estes

This mini bulk pack provides 6 of the Estes D12-3 model rocket engines which are intended for larger & heavier model rockets. Refer to the instructions or packaging that came with your model rocket for the engines you should be using. 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 flights for larger model rockets
The only way to get D engines in bulk.
Estes engines are the model rocket industry standard