Like most mechanical pencils

3mm round soft brush tip

due to the fine tip of the brush

When changing the tip

This has a 2 mm wide chisel tip and is filled with Sakura's popular Pigma ink

sakura solid paint marker glow in the dark Painting on stones Like most mechanical pencilsSelf luminous industrial paint stick that can be used on most materials, including dirty, rusty or wet surfaces. The color "recharges" when exposed to light and then shines in the dark. How strong the effect is depends on how much light the paint is exposed to, and for how long. The color is permanent and dries in a few minutes. The crayon is fed all the way by turning the bottom of the pen. Can be used in temperatures from 10 C to 120 C.