Since it is a knock-type whiteboard marker, you can insert and remove the pen tip by simply pressing it, and there is no risk of losing the cap. You can write quickly with one hand, which increases work efficiency. Refillable ink cartridge. Ink capacity is 1.5 times larger than the manufacturer's previous product. The pen tip returns to its original position when clipped. The pen tip is a round core, medium type, and the writing line width is 1.9 mm.Alcohol-based oil-based pigment ink,Interchangeable body type,material-Barrel, knock, cartridge cap: 100% recycled PP