The Winsor & Newton Designers Promarker Brush - Ruby is an essential tool for any artist. This marker is perfect for creating vibrant, detailed illustrations and artwork. It features a brush tip that is ideal for creating both thin and thick lines, allowing for a wide range of artistic expression. The marker is filled with a highly pigmented, alcohol-based ink that is both lightfast and waterproof. The ink is also non-toxic and acid-free, making it safe for use by both adults and children. The marker is easy to use and requires no special instructions. Simply uncap the marker and start drawing. The marker is also refillable, so you can keep using it for years to come. The Winsor & Newton Designers Promarker Brush - Ruby is an excellent choice for any artist looking to create beautiful, vibrant artwork.