The white pad is in the neighborhood of 1200-1500 grit.
The blue pad, by my best estimation, is close to 1000 grit, not close to the maroon's 320 grit. The blue pad needs a good deal of pressure ot make and inmpression on bowling balls. I have a bunch of them in the supermarket version for the kitchen sink, backed with a sponge pad. They're 2.5" x 4.5" in size.
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"None are so blind as those who will not see."
(That includes me too, at times! )