The Winsor & Newton Designers Promarker Blender is an essential tool for any artist or designer. This marker is perfect for creating smooth, seamless blends and gradients. It is double-ended, with a broad chisel nib on one end and a fine bullet nib on the other. The ink is alcohol-based, allowing for quick drying and vibrant colors. The ink is also non-toxic and acid-free, making it safe for use on a variety of surfaces. The marker is refillable, so you can use it over and over again. It is also compatible with other Winsor & Newton Promarkers, allowing you to mix and match colors to create unique designs. The marker is easy to use and can be used to create a variety of effects, from subtle shading to bold, vibrant colors. With the Winsor & Newton Designers Promarker Blender, you can create beautiful artwork with ease.