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Generally speaking, the user needs to insert the thumbtack strenuously to fasten the document to a background, especially for female user. On the other hand, the thumbtack is hard to be removed by hand as well.
It is easy to get hurt that the user takes a thumbtack from a bulk-packed box in general. Being one of stationery as well, a thumbtack is expected to be a portable, safe and convenient one as a pen. Finish being used, the thumbtack will be packed in large number by the smallest space.