The Pen Style Chaco Liner utilizes chalk from a serrated rotating wheel at the tip to make our marks. This allows a very smooth application of marking chalk in any straight or curved design on virtually any textile surface. It is available in 5 colors and has cartridge style refills. The color selection allows us to find the one that contrasts the best with our fabric. When the marks are no longer needed they can be simply brushed or washed away. Warning: ironing or dry cleaning the chalk marks may make them difficult to remove.