The Winsor & Newton Designers Promarker in Indigo Blue is a professional-grade marker that is perfect for any artist or designer. This marker features a dual-ended design, with a broad chisel nib on one end and a fine bullet nib on the other. The alcohol-based ink is highly pigmented and lightfast, ensuring that your artwork will remain vibrant and true to color for years to come. The ink is also non-toxic and odorless, making it safe to use in any environment. The marker is also refillable, so you can keep using it for years to come.The Designers Promarker is ideal for a variety of applications, including illustration, graphic design, and calligraphy. It is also great for coloring, blending, and shading. The ink is quick-drying and smudge-resistant, so you can create beautiful artwork without worrying about smudging or smearing. The marker is also easy to use, with a comfortable grip and a smooth flow of ink.The Winsor & Newton Designers Promarker in Indigo Blue is a great choice for any artist or designer looking for a professional-grade marker. With its dual-ended design, highly pigmented ink, and easy-to-use design, this marker is sure to help you create beautiful artwork.