Turn any metal surface into a green chalkboard instantly with MagFlex magnetic flexible green chalkboard sheets. These sheets are ideal for use as an interchangeable chalkboard, or for application on filing cabinets or refrigerators, providing a fun and practical surface for leaving messages, writing shopping lists, or for children to draw on. You can also use liquid chalk pens with these sheets; a damp cloth is sufficient for removal. Please note, these sheets are not suitable for attaching 'hard' permanent magnets, as the strong magnetic field can weaken the sheet's own magnetic field. The sheets are 600mm wide and less than 1mm thick, magnetic on one side with a chalkboard finish on the non-magnetic face. Each sheet has a striped north-south polarity for a secure grip and a pulling force of 40g/cm2. Expert advice and technical support are available after purchase.