This collection box of uni posca marker ultra fine tip pc 1m pens feature extra fine, precise calibrated tips to produce refined lines which are 0.7mm wide with a water based ink which produces no odour. Features a pack of 22 assorted colours including black, blue, brown, gold, green, light blue, light green, orange, light orange, pink, red, red wine, silver, violet, white, yellow, ivory, beige, grey, slate grey, straw yellow and light pink.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 varnish. Pack of 22. Pc 1m. Assorted colours including black, blue, brown, gold, green, light blue, light green, orange, light orange, pink, red, red wine, silver, violet, white, yellow, ivory, beige, grey, slate grey, straw yellow, light pink. Precise, calibrated tip produces refined lines. Extra fine 0.7mm line width. Will write on almost any surface. No odour. Water based. Permanent on porous surfaces. Erasable on smooth surfaces. Bleed proof on paper and card