Jet Engine Kit Highlights: The Jet Engine Model Components Kit contains all the necessary hardware components for assembling a Engine Model. To complete the assembly for an entirely functional piece, users also need to download the model files and 3D print the remaining parts. Just follow the step-by-step guide, no expertise needed! Snap, click, and feel your ride materialize right in your hands. Stuck? The MakerWorld community' s got your back. What's Included: M2.5x10 SHCS (Machine Screw) 80 PCS M2.5 Stainless Steel Hex Nut 80 PCS M2.5x5x0.5 Stainless Steel Flat Washer 150 PCS 6204 Plastic Deep Groove Ball Bearing 2 PCS 6003 Plastic Deep Groove Ball Bearing 2 PCS Please note that the product does not include the 3D printed parts as shown in the main image.