Amazon.com : Hainenko Value Fine Non-Permanent Pen for Overhead Projector Sheet - Assorted (Pack of 4) : Office Products
Lumocolor Universal Non-permanent Marker - Medium Marker Point - 1 mm Marker Point Size - Refillable - Assorted Water Based Ink - Polypropylene Barrel - 8 / Set - Brant Basics
Lumocolor Non-Permanent Superfine Markers (set of 4)
Faber-Castell 1526 Non-Permanent OHP Marker Pens - Medium - Wallet of 6 Colours | eBay