16 (Based on Use in Commerce) Pens, fountain pens, ballpoint pens, pencils, felt-tip markers, felt pens, pen ink cartridges; writing inks, ink sticks, ink stones, pen nibs, pen nibs cases, pen or pencil holders, pen cases; writing case set, namely, writing case set composed of pens, pencils, pen ink cartridges and writing ink; writing instrument accessories, namely, a wristband for the retention of writing instruments on the wrist, pen boxes; writing pads and diaries, name card paper; paper sign holders, note books, note paper, posters, calendars; leather book covers for holding diaries; writing desk sets made of leather and imitation leather