Touch Twin Markers - Singles Touch Markers are made of odorless and non-toxic purified Ethyl Alcohol based inks. Touch will not dissolve toner inks. Safe to use on toner copies without smudging. Touch Twin Markers come in 168 brilliant colors. With two different tips (1mm and 4mm), they are ideal for both larger areas and precision drawing. Touch features the special "round edge design" which stops it from rolling off the work surface, avoiding this interruption to your work flow and the true color is now clearly marked on the lid, ensuring that you can find the right pen quickly and with certainty.