The sensor notifies you of the complaints of dry erase markers at once! ]
Can you write? Cant write? This is a 5 pack of blue lead with a bold white erase marker that you can see at a glance.
The newly developed ink makes it easy to write and erase without any residue until the end.
Easy to refillable cartridge makes it great for saving money.

From the Manufacturer

Knowing Sensor, Broad Point Log

The "Know Sensor" lets you see how much ink is left.

Ink is easy to write and erase, with no residue until the end.

Easy to refillable cartridges.

Ink Color: Black	Ink Color: Red	Ink Color: Blue	Ink Color: Green