Pentel Straight liquid back pressure whiteboard pen, mwl5m thick rod 6.0mm/mwl5s thin rod 4.0mm round pen head art supplies|Dry Erase Markers| - AliExpress
Pentel Maxiflo Whiteboard Marker and Magnetic Eraser Set - Whiteboard Markers - Highlighters and Markers - Stationery Supplies - Office and Stationery | Consortium - The Education Supplies People
Pentel Assorted Maxiflo Whiteboard Marker - Black (Pack of 4) - Walmart.com
Pentel Maxiflo Flex Liquid Ink whiteboard marker, 4 mm (Box of 12), Blue | KVG