UNI-BALL Rollerball Pen “EYE”
Like many of Uni-ball’s products it combines their unique ‘uni-flow’ consistent ink delivery with uni Super Ink technology. This makes the UB-150 and UB-157 water, fade and tamper proof. The window barrel allows you to see when the ink is running out. This combined with its extreme reliability means there are no concerns about the pen suddenly stopping or running out unexpectedly.