Specifications: The ink level is clearly visible. Dry erase marker with cartridge replacement. Material: Shaft / Cap / Cartridge / Cover: R-PP; Body Size: Shaft Diameter: Diameter 0.9 inches (24 mm) x Length 5.3 inches (135 mm); Writing Line Width: Approx. 0.1 - 0.2 inches (3.6 - 4.0 mm); Oil Based Ink (Alcohol-type); Cartridge Replacement; Breathable Cap ; Dedicated Cartridge: PMR-BP03 (Painter Dot Com Postcard A1