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there are no textures in the pictures even.  Pure flat lowpoly shading.

ok, I see. So if we download these and import them into a game engine like Unity they will come in grey? We have to apply the color to the material? Sorry for all the questions, just want to make sure before downloading.

They use a MTL file defining the colors.  In truth, you really do need something like Assetforge to put things together.  Consider this more like a building block set.

Ok, thank you for this explanation! I really appreciate it.