INDIA STONES???... Sharpening knives in the field??

Yes, because they're made from recycled material they're more akin to a natural stone in that they have no defined grain size to them. They're best used with firm pressure to prevent glazing the stone, as they're a fairly hard bond (necessary to keep the different abrasive types together as they don't normally play nice with each other in a single binder) but they cut quickly while leaving a finish that's finer than you'd normally anticipate for something of their level of aggression, though they're definitely in the "coarse" camp.
 
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