The Pentel MWL5M dry wipe eraser set has 4 medium bullet tip markers which provides long-lasting ink and vivid colours. It incorporates a magnetic eraser which can be safely left on a wipe board. It's suitable for classroom or meeting presentations on white or porcelain boards. It's a high quality, long lasting dry wipe marker. It has a unique pump action system to replenish ink supply if the tip has dried out. Its medium bullet tip provides an approx. line width of 3mm