Special marker pen "Non-Permanent" | purchase online
Staedtler Lumograph Non-Permanent Wet Erase Marker Pen, Extra Fine Tip, Low Odor Colored Markers, Black, 311-9 - Walmart.com
Lumocolor Universal Non-permanent Marker - Medium Marker Point - 1 mm Marker Point Size - Refillable - Assorted Water Based Ink - Polypropylene Barrel - 8 / Set - Brant Basics
Amazon.com : edding 151 F - OHP non-permanent marker pen. 0,6 mm Black : Office Products