Finally, a thin line in a dreamy blue color and waterproof ink (when applied with a liquid brush, it lifts an imperceptible amount of color, it doesn't affect reading at all and minimally affects watercolor painting). Comfortable, glides on the page, but it's not suitable for very cheap thin paper, and in general, it takes its time to dry and become waterproof. It's worth it only for the 0.38 line.