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This is a portable free combination marker.
There are many existing markers in many colors,
and it is inconvenient to use and carry, and it is
easy to cut off the water if the pen oil is not applied
in time. Removable oil injection penThe combined
marker can be matched with colors according to your
needs. , Can indirectly remind people to cover their
pens in time.
Beihai college of art and design