Whiteboard pens (multi color) is used: 1 the nontoxic ink ink, in line with international standards, clear, easy to clean, leaving no trace, write about safety in durable, dust-free, pollution-free, writing smooth, smooth, brightly colored, clear writing. 2 no cap for 24-hour dry ink, ink refilling and reuse, and quality assurance. 3: marker suitable for all primary and secondary schools, tertiary institutions, and various training institutions, essential teaching tools enterprises, administrative bodies, Office tools in the meeting room, can write on the Whiteboard. 4: marker main colors are red, blue, black, green.