The ultra-fine 0.7mm tip of this pack of 8 Posca paint markers is perfect for very fine and detailed work. - POSCA Artist Markers Use Water-Based Pigment Ink to Produce Poster-Like Vibrant Colours- Non Bleed Ink Doesn't Feather or Bleed Through Paper- Easily Removed From Glass; Ideal for Temporary Signs on Windows, Windscreens etc- Writes on virtually any surface: Metal, Glass, Plastic, Stone, Fabric, Photographs etc. 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