Markathon Pump is the only dry erase marker that will never dry out, even when left uncapped. Markathon Pump features a unique Inkjector Pump system. Simply place the cap on the back of the marker, and press to refresh ink flow. Markathon Pump uses rich vibrant ink that works perfectly with dry erase boards and glass surfaces. Firm chisel tip writes fine to broad lines. Each pack includes 12 markers.