Radar Twist Shaped Eraser Pens
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The cap is a screw type. Turn clockwise to close and counterclockwise to open.
Turn the grip clockwise to extend the eraser before use. If you put it out too long, it will break easily. The length to put out should be about 5 mm.
When you have finished using the eraser, turn the grip counterclockwise to store the eraser.
Round, Square, and Triangular shapes.