The dual point multipurpose marker leaves a permanent mark on most non-porous surfaces. One end is for details, with an extra fine plastic point that won't break down. The opposite end is for broader lines, with a tough fiber point built for heavy use. Low odor and meets non-toxicity requirements Alcohol based cleaners will remove ink from non-porous surfaces Waterproof and writes on leather, metal, wood,glass,CDs, plastic, and photographs