non-toxic marker pen, pens: pollution-free,meet EU and ... board surfaces rich colored,refilled non-toxic marker pen,whiteboard marker pen: Features: 1 Alcohol based permanent ink, and ... glass, posters, whiteboard and so on.3 the ink on the marker pen dries faster and non-toxic, environmental, and ... a process of polymerization.4 we can make the profile according your requirment, For those who wants ...