Clover's Chaco Liner is a thin chalk marker with a refillable reservoir. The rotating serrated wheel produces fine markings on materials. The screw-on cap stops powder leakage and keeps moisture away. It is not recommended that you iron or dry clean the marks as they may become permanent. Before use, you may want to test the Chaco Liner on a piece of scrap fabric to ensure that the lines can be erased. Chaco Liner Chalk Wheel Refills available in a 2pk.