POSCA Paint Pens work on most surfaces and are permanent on absorbent media such as paper and card, and can be removed from shiny surfaces with a scraper. This assorted set of ultra-fine POSCA PC-1MR pens are Opaque water-based pigment ink and writes on any surface and won't bleed through paper. They have a 0.7mm bullet tip. This pack Contains one each of black, green, blue, violet, red, pink, yellow and white. 

Posca - Paint Markers Standard Colours Ultra Fine 0.7mm