Nobo Chalkboard Insert A1 Black (Pack 2) 1902436 Transform your Nobo A0 A-Frame poster display into a blackboard A-Frame for creating erasable chalk signs using chalks or Nobo liquid chalk markers. Simply lift up all four sides of the existing Nobo A0 A-Frame and insert the blackboard sheet, then 'snap' shut. Replace the weatherproof anti-glare PVC cover to create a long lasting chalk signs that is protected from rain, dust and dirt. Suitable for use with Nobo A0 'A' Frames, 1902206