This Tombow Dual Brush Black Pen can be used for any of your sketching drawing needs. These pens are particularly popular with graphic artists and watercolourists. The two tips make it versatile for any project from simple colouring in to complex art pieces. The brush is durable yet soft for creating fine, medium or broad strokes and is also ideal for filling larger areas with colour. The ink inside the pens won't bleed and is odourless and acid-free.