Window highlighter with double-sided design incorporates a broad, 4 mm windowed chisel tip for highlighting blocks of text on one end and a fine, 0.6 mm tip for writing and underlining on the other end. The windowed chisel tip lets you see ahead of where you're highlighting so that you can stop highlighting exactly where you want to. Window highlighter with double-sided design incorporates a broad, 4 mm windowed chisel tip for highlighting blocks of text on one end and a fine, 0.6 mm tip for writing and underlining on the other end. The windowed chisel tip lets you see ahead of where you're highlighting so that you can stop highlighting exactly where you want to.