The super-Chalk Chalks write very clearly on a standard blackboard. With a wet sponge can remove the font like normal chalk, thus also affix corrections. Compared to conventional chalk is the font of Super Chalk brighter and more noticeable. Application possibility: With normal chalk create the painting, with Super Chalk markings (frame, arrows ...) and so inflict explain relationships. If necessary you can take the Super Chalk writing on other surfaces (windows ...) when the panel is not sufficient again :-) The indications of the supplier were very detailed and helpful. (Please read and observe ...)