Replacement powder‑chalk cartridges for the UNIQUE heart‑shaped chalk marker. Two refill cartridges keep the marker writing crisp lines for pattern work and alterations. Designed to install quickly so tools stay in use with minimal downtime. A practical add‑on for classrooms and busy sewing studios. Follow the package directions and test on a scrap to confirm compatibility. Work on a stable surface and use light, controlled pressure for best results.