Zebra Mildliner Highlighter 5 Color Set. Mildliner highlighters offer unique mild ink colors that show up softly on paper. These highlighters are dual-sided: on one side you will find a standard chisel-tipped marker for highlighting text, and on the other side of pen is a finer bullet tip that can be used for writing, underlining or circling your notes. In recent years, Mildliners have become a favorite item for bullet journalers and students who love to make beautiful study notes, and in our opinion, these highlighters are a very welcome change from the neon fluorescent highlighter colors we are used to seeing!