The Pentel Knockle Fit is the brush pen of Whiteboard Markers! Like the rest of the Knockle line, it is unique from other whiteboard markers in that you pump the ink into the tip as you need it. This version has a flexible tip that allows you to control the thickness of your lines.
Available in orange, purple, green, black, blue, and red
Clear ink cartridge allows you to see ink level
Knock mechanism keeps your writing bold, even when ink is low!
Pump several times upon first use to get it started