The Zebra Sarasa Dry is not only one of my favorite gel pens to write on the Tomoe River Paper, but also one of the most comfortable pens I have ever used! The Airlift grip is super soft and bouncy and molds to your fingers. It's truly the ultimate choice for long time writing. 0.5mm : slightly bolder other brands 0.4mm : equivalent to 0.5mm of other brands