Bistro Chalk Marker creates a dustless smooth layer and rich colors that are water based, non toxic and fade resistant. Perfect for home, office and school. Try them on whiteboards, glass, backlit boards, presentation boards, metal boards and other non-porous surfaces. The color will remain until you decide to wipe it off. This package includes four 6mm broad tipped markers in neon pink, neon yellow, neon green, and neon blue.