zebra mildliner soft color double-sided highlighter pens deep, warm & cool, 15 color full set with original vinyl pen case zebra this “mildliner” give you pleasure and comfortable while writing book or note, anything else.this “mildliner” have something special soft and cool color. this “mildliner” is multipurpose. especially, i suggest this “mildliner” to student and illustrator, some expert for writing or marking, drawing. each one has two different thickness ballpoint.