It"s the world"s thinnest gel pen! The tip is so small you can write words on a grain of rice. The tiny needlepoint tip of this pen will let you scratch notes into the smallest of places. The Uni-ball Signo Bit line is famous for their small and thin writing ability. This product, already rare in the US, might become even more rare as certain colors have started to become discontinued from Uni-ball Japan. Get them while you can!