https://youtube.com/shorts/QoKaWQSD9JcWhat you get will be digital files, including PDF, DXF, STEP, 3DPDF formats. What you get is not a physical product. But you can manufacture this products with these files. Note: Digital goods cannot be returned.
Most parts should be made from wood. Because some parts are big, perhaps you need to make some adjustment according to your materials and machines. The DXF format files are for CNC machining or laser cutting. Some small parts can be 3d printed too.
The whole mechanism can be used as a functional unit. When you rotate the “Drive Gear” or the “Ring” , the blades in the center hole open or close gradually. It is similar to a camera aperture or iris diaphragm. The center hole is 500 mm.Ignore the FBX and OBJ format files, they are only used to meet the platform’s requirement.