As for the grit there is no practical difference between Abralon and Siaair when new both use the same scale.
Abralon uses silicon carbide as its abrasive
Siaair uses aluminum oxide as its abrasive.
Siaair last's a little longer than Abralon, But Abralon is usually a little cheaper in cost.
You can make Abralon last longer if your careful not to use too much pressure when using them.
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