I think Storm may use a different grit chart than other companies, thus the use of the abralon pads for instance at 4000 grit = 1500 grit in US terms. Europe(where the Abralon abrasives are produced) uses a standard called FEPA. USA uses a ANSI or CAMI standard.
Check out this chart.
http://home.earthlink.net/~litefroze...grit_chart.pdf
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