Zacuto's Z-Focus 3D Dry Erase Operator's Marking Disc is a new 3D marking disc that allows the camera operator to see focus marks while operating the camera. This disc is magnetic and dry erase, and fits on all Zacuto follow focuses, including the Z-focus.

Product highlights
Fits All Zacuto Follow Focuses
Magnetic Attachment
Easy Viewing

(Link to the Z-focus here).