The fine pen point permits accurate drawing of both straight lines and freehand curves. The refill cartridge for Chaco Liner Pen Style (sold separately) is easy to replace when the powdered ink runs out.
Test the pen first on a piece of scrap fabric to be sure that the lines and marks can be erased. Do not use on fabrics that are not washable.
Keep the Chaco Liner pen style as vertical as possible during use (the powdered ink will not flow smoothly from the pen if it is at a sharp angle). Ironing or dry-cleaning may make the marks permanent.