The uni-ball Eye Micro rollerball, one of the most popular pens in the world for more than 20 years, offers a clear and fluid writing experience. It incorporates uni Super Ink technology along with the distinctive "uni-flow" ink delivery system, just like many of Uni-ball's products. The UB-157 is now water, fade, and tamper proof as a result. When the ink is almost out, you can see it with the window barrel. This, along with its exceptional dependability, means that there are no worries about the uni-ball Eye running out of power or stopping unexpectedly. The pen is ideal for fine writing because of the way its lines are micro-detailed. Technical drawing and sketching are also excellent uses for it. This pen is available in black, blue, green, light blue, and light green, and it has a 0.7mm nib.