Black is the most frequently used-and fought over-sublimation marker color.with this box of six black markers, which includes two round nibs, two fine nibs, and two chisel nibs, you'll have plenty of black sublimation markers to share with your friends and last through many projects.and with three different marker nibs to work with, not only can you vary your drawing styles, but you can also insert them into an electronic cutting machine to create perfect outlines to fill in with other colors.this 5.5x3x.5 inch package contains six sublimation markers with assorted nibs.conforms to astm d 4236.