This Touch Opaque Extra Fine marker has a fine tip, about 0.4-0.7mm thick, which allows you to create extra precise lines and fine details in your artwork. Its special formula of ultra-concentrated ink and pure pigments guarantees high-quality opaque and light-fast colors. Another advantage of these acrylic markers is that they are water-based, which means they are odorless and non-toxic. You can use these markers safely without worrying about health or environmental impact.