These belts have electrostatically oriented particles (on a mylar backing) that cut quickly, but leave a near mirror finish. The belts become finer in use as the silicon carbide particles are reduced in size through fracturing. Very controllable, they are ideal for carving tools, but are equally usable on straight-edged tools like chisels. 15 micron is the equivalent of 1000x in Japanese water stones. Made in USA.