The Posca Mono Tones Paint Marker Pen Set is a set of 4 markers that features medium bullet tips and contain a unique water based pigment ink that can be used on a majority of surfaces. These pens are water resistant and fade proof, and also provides you with no bleed through when using on paper.Specification Pack of 4 marker pens Medium bullet tip Colours: Black, White, Gold, Silver Line Width: 1.8mm to 2.5mm Treatments Glass: Bake in the oven at 160°C for 45 minutes then spray with clear varnish Textiles: Iron on reverse Metal/Plastic/Wood: Spray with clear varnish Terracotta: Bake at 220°C for 45 minutes, then spray with clear varnish Porcelain: Bake at 160°C for 45 minutes, then spray with clear varnish