Uni Prockey Permanent Markers can be used on almost any surface to create bold opaque marks. The water-based pigmented ink is odourless and is waterproof and fade-resistant when dry. Use Uni Prockey Permanent Markers on a variety of surfaces from glass, metal, plastic, stone, and wood - ideal for a variety of design and decorative craft projects. If using the markers on paper the ink will not bleed through.