FeaturesWhiteboard marker with unique pump action system to replenish ink supplyPress end button to rejuvenate ink flowFor use on white or porcelain boards6.0mm medium bullet tip gives a line width of approx. 3.0mmPack of 12 black inkThe Pentel Maxiflo Medium Bullet Tip Whiteboard Marker (Box of 12) has a unique pump-action system that replenishes ink supply. Vivid liquid ink for white or porcelain boards. Remove with a dry cloth or board eraser.  Approx. 2.5mm line width.Video.iframe-container {overflow: hidden;padding-top: 56.25%;position: relative;}.iframe-container iframe,.iframe-container video {border: 0;height: 100%;left: 0;position: absolute;top: 0;width: 100%;}