Create four line widths from one double-ended marker. One end has an extra broad nib that produces color fast with paintbrush-like strokes, and the other end has a fine tip for sketching, detail work, or cleanup. Each marker has a "click-fit" cap, in order to prevent the marker from drying out or nib damage. The solvent-based ink is fade and water-resistant. Artists' quality art markers for every level of expertise. Advanced ink formulations provide rich color saturation with smooth, silky ink flow and coverage. Impressive color laydown. Different line widths available with each double ended art marker. Alcohol, dye-based ink. Single ink reservoir for a perfect color match end to end. Ideal for both technical and artistic applications. AP Non Toxic.