Decorate almost any surface with this versatile and highly pigmented pack of 16 uni posca marker pens with a fine, bullet fibre tip.this set of uni posca marker pens features a very fine bullet tip to produce lines which are 0.7mm wide with a water based ink that can be used on almost any surface.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 varnish. Fine 0.7 1mm line width. Bullet tip. Pack of 16. Will write on almost any surface . Water based. Permanent on porous surfaces. Bleed proof on paper and card. Approximate dimensions mm h 122 w 123 d 36