Replacement chalk powder cartridges for the UNIQUE hem marker. Includes one light and one dark cartridge to create high-contrast marks on a variety of fabrics. Fine chalk flow delivers crisp, visible guidelines for even hems and alterations and brushes away or washes out of most fabrics. A quick way to keep your hem marker performing reliably in the studio or classroom. Designed for everyday sewing rooms and classroom use; dependable quality with clear sizing for easy selection.