Permanent indelible fibre marker pen assembled with black barrel coloured barrel-tip, cap and safety button with a fine liner tip, filled with alcohol-based permanent ink suitable for writing and marking on almost all not heavily contaminated surfaces with the exception of certain plastic materials and highly porous surfaces. After drying, ink will be permanent and waterproof. Colours: red, blue, green, black. Nib thickness: 1 to 1.5 mm.