1) aluminium framed whiteboard or chalkboard is available;
2) magnetic (porcelain enameled or lacquered surface), or non-magnetic whiteboard or chalkboard is available;
3) middle filler of corrugated or honeycomb cardboard, MDF, or LDF is available;
4) height of three painted legs is adjustable;
5) top clip can clamp papers;
6) normal or special corkboard sizes are available.