The Staedtler Lumocolor permanent marker set comprises of four permanent markers featuring varying writing widths. The black markers offer round tips for lines of 0.4mm, 0.6mm, and 1.0mm, along with a chisel-shaped point for lines of 1.0mm or 2.5mm. These versatile pens are compatible with nearly all surface types. Their smudge-resistant and fast-drying ink make them ideal for left-handed users as well. 97% of the exterior material of these pens is made from recycled plastic.