The AOWA Whiteboard Marker set comes with 10 pieces, providing a reliable solution for clear and bright marking on any whiteboard. These markers are designed to be erased easily without leaving ghosting residues, which keeps your workspace clean and professional. To ensure long-term use, the markers are refillable, reducing waste over time. Your health and safety are considered in the chemical composition, as the ink contains no xylene or toluene. To maintain the quality of the ink, you should store them horizontally and ensure the caps are kept firmly closed after each use.