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Thx for the tip, for the 1k stone it doesn't even have a big difference.

I'll go for the super stones then.

(last time i put a cheap secondhand part on my motorcycle, it broke of again. I wont...

I believe these are the same: 175 mm x 55 mm

Naniwa Japanese Combination Waterstone
Naniwa Japanese Waterstone

The naniwa stones come in several types, most mentioned here is the chosera i think, the hardest stone they have. The work stones are cheaper but apparently softer.
Any reason why i should steer...