Do I have to use the iskn Pens to draw with the Slate?

The Pens are fitted with a special magnet ring and are designed to be used with the Slate. 

You can also use the Ring to turn selected crayons, markers, pencils, and calligraphy pens into Slate-compatible pens.

Ordinary writing instruments that are not a Pen or not fitted with the Ring are not Slate-compatible. 

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