This oil-based paint marker pen is perfect for decorating and painting on a variety of surfaces including paper, cardboard, canvas, polystyrene, wood, fabrics, metal, glass, plastic, and leather products. It is durable and non-washable after drying, making it suitable for professional, hobby, school, and home use. Artists will appreciate the wide range of 17 available colours. To use, shake well with the cap on before use and press the nib down several times until the paint flows out. Keep capped when not in use. The line thickness is 2.5 mm.