POSCA Pens are a great choice of marker for versatility and quality and can be used to write or draw illustrations on almost any surface. This pack of 5 markers contains assorted nib sizes so you have a marker for any job!If used on porous surfaces such as paper, cardboard, stone, wood, silicone, fabric or unglazed ceramic, these pens are permanent.Smooth surfaces such as glass, glazed ceramics, PVC and smooth metal means your design will need fixing with a spray of water based varnish, apart from glass which should be put in a 160 degree oven for 45 minutes beforehand.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 varnishIncludes:. PC-1MR Posca Ultra Fine Bullet Tip . PC-1M Posca Extra Fine Bullet Tip . PC-3M Posca Fine Bullet Tip . PC-5M Posca Medium Bullet Tip . PC-8K Posca Broad Chisel Tip