In Uni propus window series, new twin markers an ultra-fine pen core suitable for writing letters have appeared！ "propus window" Series has been developed as a twin Type for both bold and thin characters. Recently, there is an increasing demand for writing on the fine print side. Therefore, a color pen that uses an extra-fine pen core and can be used not only for underlining but also for writing letters has appeared. in recent years, The colors used in notebooks tend not to be too conspicuous, and light colors with weak fluorescent colors tend to be preferred. Three types of ink were prepared for each of five colors. Good and clear Basic color, soft and friendly Light color, and calm and gentle smoke color. You can use them according to color preference, presence or absence of fluorescence, and usage. ] a pen core with a window, which is a feature of the “propus window” series, is used to display characters while drawing the line, so that it can be clearly marked without protruding from where you want to draw the line.