Thanks, Jon, but I was looking for one in the US.
Those square ones I've only seen on UK websites. There are non-abralon sanding foam squares, but they are expensive and don't last as long as Abralon.
FYI Square/rectangular ones are better for hand sanding of wood. ROund ones seem better suited for balls on the spinner. They just feel right, each for its job.
I've cut the 6" standard Abralon pads into quarters when sanding smaller pieces of aluminum (& other metals) sheets.
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"None are so blind as those who will not see."