Like most other On The Run pens

When the ink runs out

and it's finished with a jumbo twist-up eraser for corrections

or filling in solid black blocks across a wider area than the medium or fine tips could cover efficiently

you can spray ultra-wide and cover walls

on the run otr 003 hard to buff squeeze marker 18 mm Mere Like most other On TheThe OTR. 003 Hard To Buff is a heavy duty squeezer loaded with ultra permanent ink, built for bold marks with that classic squeeze marker flow. This one hits with deep black coverage and a smooth, juicy output. The 18 mm nib gives you wide strokes, fat drips, and big letter movement when you want your lines to really stand out. Inside youve got the legendary OTR. 970 Hard To Buff ink known for sticking, staining, and holding solid on pretty much