The texture resolutions vary a bit depending on how they were captured or created and what they are for, but the most common resolution is 4k, and the others tend to be between 3k and 4k.

The maps resolution varies a bit from kit to kit depending on their source and purpose. They are basically all somewhere between 2.5k and 5k, with the majority being at 4k.
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In the meantime, we encourage you to check out one of our minikit, and we can't wait to see what you create with it!