Global Ceramic Medium 1000 Grit Whetstone is great to maintain or sharpen knives that have become blunt. This stone used at a 10-15 degree angle can put back the incredibly razor sharp edge of your Global knives. Stone sharpening is the best way to sharpen your knives. Ceramic stones do not need to be soaked; just wet. Ceramic stones are harder than waterstones; therefore, ceramic stones sharpen your knives quickly, will last longer than waterstones, and will not develop groves.