As a sports mom, I am always marking up my car windows and it is hard to find high quality RED markers that don't come in kits of a ton of other colors I don't care about. This pen is diverse because it is 15mm wide, but about half that when turned on the side and can also write fine on the corner. The color is a true red and works great with our team colors.The pen washes off easily and does not leave residue behind. Such a great pen, everyone always wants to borrow it, so I share the link instead a few weeks before we need to mark up our cars ;)Works as great on paper as it does a smooth surface, you can't go wrong! Buy 2, you will thank me later!Neomarker Large Waterproof Marker Broad Tip - Red