One end is for details with an extra fine plastic point. The opposite end is for broader lines with a tough fiber point for heavy use. Xylene free – Low odor. Alcohol based cleaners will remove ink from non-porous surfaces. Writes on most of non-porous surfaces, such as leather, metal, wood, glass, CD, plastic and photograph. Line width:0.4mm (Extra Fine) & 1.0mm (Fine).Available in 7 colors; Black, Red, Blue, Green, Orange, Brown and Purple.