This model contains 2 separate objects.
Has 3 simple materials: (preview 2)
The materials are changeable, customizable in any software. The preview image shows diffuse colors, by which, if necessary, you can choose a color in your program. If the program does not provide such an opportunity, the kit includes diffuse texture maps, roughness and metallic. The binding of the material to the mesh is indicated in the 2nd preview. If you need help or have a problem with the model, I will be happy to help.