The stone with the coarser grain size, ie 240/1000 you need really only when one has done an edge in the blade or you want to grind a new edge. Depending on the grinding can here but already take a little time to complete and accordingly varies the abrasion. Consequently, you should not waste this stone at cheap knife, since you usually have to grind once a decent cutting here. nevertheless you really get each knife with a smooth (no sawtooth) blade again very, very, very sharp.
The finer stone is actually quite sufficient, for example, to grind a Damask by Kling and polish. The whole process takes after soaking the stones even more than 5 minutes. Whether the stones are also suitable for ceramic, I doubt there is, stones needed for this rather artificial, usually mixed with diamond.
Both stones are natural, but so far I could find no major unevenness of the abrasive particles. Unevenness may also quickly lead to edges or you get the knife not evenly sharp here.
The handling is easy, takes account of the preparation time (you have the stones 15 soak in water) but a little longer. But the grinding can be done by anyone and on the Internet, there are also plenty of instructional videos (the attached instructions Although enough, but certainly not one feels so). The stones are large enough and if they do slip a bit, simply place them on a towel. So do not be afraid when grinding and prefer to use a good whetstone and "grinding" throw in the trash.
The only thing that really stands out is negative, but the very high price, but in combination with good knives, stones should then very, keep very long. So whom the price is an eyesore, a high-quality knife has, is with the fine grain actually adequately served, and buys this stone individually. Alternatively, you can also look artificial stones, but not too small it should be.
In short one due to the price but somewhat limited buy recommendation.
