To keep the tip richly saturated with ink, the Knockle features a special pump system. When you first start using the marker, post the cap onto the back of the marker, point the marker tip-down, and press the cap down a few times to pump ink into the tip. If the marker starts to write dry as you use it, push the top cap again to re-saturate the tip.
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.
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