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it means they are different thickness

you can;t mix grits , you need wheels for every grit
here read this
Introduction To Buffing and Polishing - Caswell Inc.

no it has to be sewn wheel to work well

that buffer might be too fast for a beginner.
But if you decide to go with it, you need 6 and 4" wheels
greaseless compound and buffing compounds. All can be found from Cawell. Make sure the...