Uniball air 0.5 mm blue roller pen set content

a valve system that prevents blockage of the trachea against the risk of swallowing by children. Uni super ink that protects your writings, signatures and valuable documents against chemicals, resists the effects of water dispersion and fading of light. An uninterrupted and controlled uni ink flow system that allows you to write fluently to the last drop of ink, the ability to continue writing uninterruptedly as soon as you take it in your hand with its ink that does not dry for a long time, even if the cover is left open. Creates a user-specific line thickness by changing the ink flow according to the user-specific new generation hybrid tip pressure. 0.28~0.45 mm line thickness 0.5 mm ball size