A good ink stick has extremely fine particles. Finally, ink stone must be made from a firm stone which does not when ground by the ink stick, or jade. In addition to the four tools, calligraphy needs other items: a yeonjeok, a container of water, used for making ink with ink stick, boot tong, a container for holding brushes after being used, munjin, a long and flat paper weigh, and pilse, a bowl for washing the brush.[8]