Serve Jumbo Liquid Highlighter highlights the most important things in vibrant fluorescent ink color. High-quality water-based pigment ink is fade-proof for dependable use. It is fax-safe and copy-safe. Larger ink supply means this chisel-tip highlighter provides a longer lifetime compared to standard highlighters. Free ink system in the large transparent reservoir shows amount of ink remaining in the barrel. Highlighter won't leak under pressure.