Permanent on porous surfaces and erasable on most smooth non-porous materials, your creations can be protected with a fixative varnish. The features of the pen include a washable and reversible tip which are also replacable. The pens are also water soluble and can be mixed and layered as desired. Colours include: Sparkling blue, Sparkling green, Sparkling Light blue, Sparkling orange, Sparkling Pink, Sparkling red, Sparkling violet, Sparkling yellow. To find out more about POSCA, head to our blog.