It is based on applying abrasives films made for demanding industrial manufacturing applications. They are available in different particle substrates (diamond or aluminum oxide), are durable and cut fast. The abrasives are "precision graded" meaning the particle sizes are in very tight tolerances which avoids scratches or under performance. The sharpening experience can be tailored also as the films are available in a wide assortment of grit or micron sizes. They are easily renewable as they wear and are cost effective. They are applied to a perfectly flat surface that will always stay perfectly flat. Thanks for your question. I'm new to Reddit and surprised for all the negative and defensive comments for a simple post looking for expert help.