White Powdered Refill Cartridge for the Chaco Liner Pen Style. The pen-style Chaco liner’s fine point permits accurate drawing of both straight lines and freehand curves. The fine point makes lines and marks more visible and is easy to use with a straight edge ruler. Marks are easily removable by brushing away the chalk line or using a damp, cool cloth. Test the pen first on scrap fabric, and do not use it on fabrics that are not washable.