Theseposca marker pensare the perfect way to make your mark the water based pens produce vibrant colours that can be used on almost any surface including fabrics glass metal paper card wood and stonethese acid free pens are suitable for a variety of applications such as outlining scrapbooking filling in colour and producing large scale art unique opaque ink makes it possible to overwrite other colours and produce vibrant colours even on the darkest surfacesthis four pack assortment o