There are 20 flexible Caster discs in the package in each pastel color: blue, red, yellow, green and white. The discs are attached to the BackCaster board by capillary force.
With Caster storage plates, you produce ideas as if on paper and at the same time avoid unnecessary accumulation of dust on capillary surfaces.
You can write and draw on them with different markers (Whiteboard marker - wipe with e.g. a paper towel, Water-soluble non-permanent marker (wipe with e.g. a water-soaked paper towel or cloth) and Permanent marker - wipe with an alcohol-based cleaning solution). The writing surface is very durable. Read the user manual before use.