Shapton Professional 8K For the Edge Pro. The Shapton Professional series has a large following and we were fortunate enough to persuade the factory in Japan to make these custom sized stones to fit the Edge Pro. We're the only ones they cut these stones for at the factory for better cuts and accuracy. We highly recommend these excellent stones compared to the stock edge pro stones. Try one and you'll see why they're universally loved by knife sharpeners around the world.