These pens were deigned by applying Tamenuri technique upon Ishime. A rough irregular surface of the barrel is achieved with Ishime-kanshitsu technique.
A craftsman sprinkles Urushi powders onto the body, which makes a lot of grains on the surface due to surface tensity. After settled, he varnishes the body with lacquer several times to make the body harden. He sharpens these grains with charcoal and finished with wipe lacquer. It is truly artistic craftsmanship to decorate stone-like appearance on a pen true to its name ('Ishi" means a stone in Japanese).