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. To keep the tip richly saturated with ink, the Knockle features a special pump system.
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High quality, long lasting dry wipe markers, Unique pump action system to replenish ink supply if tip has dried out, Vivid pigment-based liquid ink,
Whiteboard Marker Pentel Maxiflo Fine Bullet Tip | Black/Green/Blue/Red | Various Pack Sizes Available | High Quality Marker for Classroom
Vivid liquid Ink Unique pump action button replenishes ink supply to nib when writing For white or porcelain boards Bullet medium tip with 2.5mm line
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PENTEL MAXIFLO KNOCKLE Whiteboard Marker Fine Broad Dry-erase Black Blue Red Pen $3.99 - PicClick