Retail price: 495 yen. New. Demon Slayer: Kimetsu no Yaiba Metacil Light Knock. Unused, unopened. Sunstar. Tengen Uzui. Stationery, writing supplies. New sensation writing instrument. Writes continuously without sharpening. Knock type with retractable tip. Less likely to get your hands dirty. Erasable with an eraser. Mechanical pencil, sharp pencil, pen. Saves the trouble of sharpening. Increases concentration. H hardness. Writes 5km. Rare.