4 / Set. Markers permanently mark on practically all surfaces. Sturdy chisel tips make broad or narrow lines. Non-corrosive Xylene-free and toluene-free alcohol-based ink is fast-drying, light-resistant, frost-resistant and virtually odorless. Ink is designed for delicate and safe labeling of CDs and DVDs. Markers offer ventilated caps and long cap-off time. Reliable under extreme conditions such as cold, heat or rain, markers are suitable for use everywhere from freezers to greenhouses.