The Winsor & Newton Designers Promarker Brush - Indigo Blue is a professional-grade marker that is perfect for creating vibrant artwork. This marker features a brush tip that is ideal for creating both broad and fine lines, allowing for a wide range of artistic expression. The ink is highly pigmented and lightfast, meaning that your artwork will remain vibrant and true to color for years to come. The marker is also non-toxic and acid-free, making it safe for use by both adults and children.The Designers Promarker Brush is easy to use and requires no special instructions. Simply uncap the marker and begin drawing. The ink will flow smoothly and evenly, allowing you to create beautiful artwork with ease. The marker is also refillable, so you can continue to use it for years to come.The Winsor & Newton Designers Promarker Brush - Indigo Blue is a great choice for any artist looking to create vibrant artwork. With its brush tip, highly pigmented ink, and non-toxic formula, this marker is sure to become a favorite in your art supplies.