Uni Mitsubishi Jetstream 3in1 multifunction oil-based ballpoint pen 0.5mm

Oil-Based Ballpoint Pens
First mticolor ballpoint pen with a new mechanism of rear-end knock only for black allowing you to intuitively knock black without hesitation.  
Red and blue inks have the same sde nock as before but the new mechanism allows the user to eject and release the color even when any ink color is ejected.  
The most frequently used black ink is equipped with a more durable lasting refill that increases ink volume by approximately 70% compared to the standard product by making the refill tube thinner.  
The design of the barrel has improved the durabity against barrel cracks and embedding a metal part in the resin cp has improved the durabity against cp breakage so the barrel itself can be used for a longer period of time and is designed in consideration of the environment.