This Shinhan touch twin tip marker set of 6 Main Colors is the perfect addition to any artist collection. These touch markers are essential for any animator, illustrator, architectural renderer or interior designer. With a fine tip nib on one end and a broad chisel nib on the other, artists can control line width. The revolutionary design of the nibs safeguards loss of firmness from use. The ink is refillable and replacement nibs are available in four sizes. The alcohol-based ink is odorless, non-toxic and permanent.