KAVCH'S Marking tailor chalk is a type of chalk that is used to make temporary markings on fabric or cloth for sewing, cutting, or altering purposes. It comes in different colors so that it can be seen on different fabrics. A pack of 20 pieces of marking tailor chalk means that there are 20 pieces of chalk in different colors in one package. You can use marking tailor chalk to mark hemlines, darts, button placement, or any other guidelines on your sewing projects. Marking tailor chalk can be easily removed by brushing, washing, or ironing the fabric