Tombow Art Dual Brush Pens are ideal for many types of arts and crafts including detailed illustrations, hand lettering or comics and manga. This pack of 12 includes a wide mix of grey shades for versatile drawing and colouring.These innovative Dual Brush Pens have two tips - one is a flexible brush for thicker lines, and the other is a fine tip for more accurate details. You can use these pens just like watercolours, as they blend effortlessly!The pens are completely safe to use, as the water-based ink is acid-free, odourless and non-toxic.. Pack of 12. 2 tips: flexible and fine . Water based ink . Colours can be mixed together . Non-bleed. Water soluble. Acid-free, odourless and non-toxic. Approximate dimensions (mm) H 225 W 150 D 14