[Name] effective Sida / whiteboard pen ink can be added 

[Model] No.S502 

[Specifications] 2.0mm 

[Color] Black / Blue / Red 

[Packaging] 10/120/960 

[Features] good writing， writing is easy to rub on the board， leaving no trace; ink does not contain xylene， environmentally safe; upgrade written more lasting wear than the ordinary type; ink can also be added， more affordable. 

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