Chalkies Liquid Chalk Marker Pen in Fluorescent Bold Highlighter Colors, Great for LED Boards, Glass, Whiteboards, Plastic, Glass, Metal, & Other Non-Porous Surfaces Safe, Non-Toxic, and Water Based Reversible tips, 2 writing styles in one marker bullet and chisel without having to purchase different kinds of markers Works on all non-porous surfaces Vibrant, bold, long lasting, no-fade colors Easy clean up with wet or dry cloth