The Pentel Maxiflo liquid ink marker pen features a unique pump action system to replenish the ink supply. Simply press the button on the end of the marker to rejuvenate the ink flow. With a 4.0mm bullet tip giving a fine 2.0mm line, this marker is easily removed from drywipe boards with a cloth. Made from a minimum of 50% recycled materials, this black marker pen is supplied in a pack of 12.