This pack of 2 Posca PC-17K Marker Pens have extra thick chisel tips and a line width of 17mm, making them versatile, perfect for arts and crafts including illustration and posters. Use the pens on practically any surface, including metal, wood, fabric, plastic, canvas, etc. They\'re even suitable to use on paper and card, as they don\'t bleed. The water-based pigment ink can be wiped off glass easily, making the pens wonderful for creating temporary signs and window art. You can even create your own permanent designs on terracotta and glass by baking in the oven, or on clothing and other fabric by ironing on the reverse. The limitations of this pen are endless making it a must-have for any home, office and business.Instructions on how to make permanent:- Terracotta - by baking at 220 degrees for 45 minutes, then spraying with clear varnish- Porcelain - by baking at 160 degrees for 45 minutes, then spraying with clear varnish- Glass - by baking in the oven at 160 degrees for 45 minutes then spraying with clear varnish- Textiles - by ironing on reverse- Metal, plastic and wood - by spraying with clear varnish. Thick chisel tip. 17mm line width. Write on any surface. Removable from glass. No odour. Water based. Bleed-proof on paper and card