Uni Posca PC-7M Paint Marker Art Pens - Large Bullet Tip - Assorted Colours
The Uni POSCA is also permanent and bleed-proof on paper and card (as it absorbs into the fibres), and can be made permanent on the following Why buy the Uni Posca PC-7M Marker Pen?. The Posca has a bold bullet tip giving a line width of 5mm.