Design source: The carrier selects the traditional Chinese copper lock. By analyzing the function and form of the copper lock itself, it combines with modern stationery to give the copper lock new functions and return the copper lock to the public view.
Function: Combined with the original shape of the copper lock, the main body shape structure is stable, and a pulling structure is added at the bottom, which can be used as a mobile phone bracket when placed on the desktop; the lock part considers the pulling action when the copper lock is used, and is combined with the action of opening and closing the pen cap to add writing function to the lock; The copper lock key is generally a flat sheet shape, which coincides with the ruler shape and can be inserted into the main body for storage when not in use.