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grit rating . all i can say is bbw 4k coticule 8k. i find this hard to relate to . i had a 4k 8k norton four years. thers no way you can compare them.

i have used both . the belgium coticule with...

I have full range of bio paste . It can leave an esdge harsh only if you over do it. You need very little strokes. Cro.ox is most popular, but i find my coticule gives an edge as good if not...