Pentel Knock-type Handy Whiteboard Marker Cartridge
Just press the cartridge, no cap required, for medium/bold nib oil-based markers. Can be used for both bold and medium nib pens. You can write smoothly and immediately with one hand even if you are carrying luggage. No hassle with caps. Economical with cartridge type. Ink Type Alcohol-based oil-based pigment ink / Ink filling method Filling Type