You want Wet/Dry Paper, But Most people these days use pads ( Abralon, Siaair, Trucut etc.) for sanding balls. Paper is a lower cost option and you can now get it in P-Scale grits like that used by pads.
I use paper (plus pads) quite often, I usually get 3M Automotive Wet/Dry (Walmart, Autozone etc.) Big sheet cut it into 4 pieces.
Example:
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