5/16"-24 Aluminum Prop Nut

Safely and conveniently store

Front bulkhead Lower hinge Pin assemblies in place

All-metal gear drivetrain for extreme durability

One Spur gear with 83 Teeth

Estes Rockets - Orbis 3D Bulk Model Rockets Material, to Print Your Own 3D, Skill Level 1 (12pk) CIS83068 5/16"-24 Aluminum Prop Nut3D printed model rockets. Buy the Orbis bulk pack, download the . stl files to print your 3D plastic parts and you are ready to build your rocket! Estes parts that you purchase + your parts that you grow = a great learning experience and lots of fun! 9 different designs and simple straight forward assembly! Features: Recommended Engines: 1781 A8 3 Bulk Pack (first launch) 1789 C6 5 Bulk Pack 1783 B6 4 Bulk Pack 1672 Blast off Flight Pack