Steel sheet lineation E1 (green) for all specially-coated writing surfaces. The vitreous-enamel coating is stoved at a high temperature by a special process. The surfaces can be written on with chalk and magnets adhere to them. Steel sheet lineation E2 (white) for all specially-coated writing surfaces of up to a width of 300 cm and a height of 120 cm. The vitreous-enamel coating is stoved at a high temperature by a special process. The surfaces can be written on with Board markers and magnets adhere to them.