The perfect permanent marker for lettering and drawing on fabric, paper, wood shrink plastic and more. Acid-free and fade-resistant with smooth, even ink flow. While heat-setting is not required, Tsukineko the manufacturer recommends heat-setting for added permanence. Brush and bullet tip and jumbo ink barrel. Set of 6 dual tip, archival and acid free and includes 1 each of 6 sorbet colors - 131 Maize, 142 Baby Blue, 137 Pale Lilac, 134 Bubble Gum, 141 Kiwi, 132 Apricot.