The U Mark A-20 contains non-toxic, fast drying and waterproof xylene free paint that meets RoHS Directive 2002/95/EC standards. Its liquid paint supply is regulated by a pressure valve. Thus, the A-20 produces highly contrasting and permanent marking on metal, glass, plastic, ceramics, wood and more. Finally, the tip of the A-10 is reversible so that both its rounded as well as its chisel shaped tips can be used.