This Copic Original Dual Nib Marker offers both a fine point and chisel nib, making it a fantastic choice for professional designers, architects, artists and students. This marker has both replaceable nibs and refillable inks which ensures that you can use it over and over. It contains alcohol based, permanent ink which is non-toxic and produces strong colours. This marker has a fine nib on one side and a chisel nib on the other. It a professional marker used by designers, artists, architects, students and more. It features alcohol based ink which dries acid-free. The unique barrel shape ensures that the marker does not roll away. The ink is non-toxic for added peace of mind. You can replace the nibs and refill the ink when necessary. This marker has Grass Green ink, also known as code YG17. These markers are compatible with the Copic airbrush system. These markers work best when used with bleed proof paper or X-Press It Blending Card. The names and codes of the colour are printed on the barrel and are easy to read. There are 9 nib sizes that will fit this marker.