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1. The Shapton Pro 15K is not only acceptable, but highly desirable... btw, belgian blue coticule is the coarser side, the yellow coticule is about 10-12K...

2. You can find it here , good price,...

Learn German in no time:)
http://babelfish.altavista.com/

Norton 4000 cuts a bit faster than the Blue coticule (so they say). If you want the best stones available, you might check the Shapton Pro series. So, you are all set with the Norton 4/8K, Yellow...