The Japanese abrasive coating offers enhanced wear resistance, making the files incredibly durable. The file has a unique self-sharpening ability. The abrasive coating contains multiple layers of sharp grains with high cutting capabilities. As some abrasive particles become dull or chip off, others immediately take their place. The special stearate coating prevents the file blade from clogging. It does not clog and sheds very little dust even after repeated use. The files are easy to disinfect.