The Uni-ball Eye Micro UB-150 0.5mm rollerball in blue is renowned for its smooth writing and Super Ink pigment ink that is water-resistant, fade-resistant, and tamper-proof. Its 0.5mm micro tip produces an incredibly precise 0.3mm fine line with no ink flow interruptions. The transparent window on the pen body allows for easy monitoring of the remaining ink level, making it ideal for signatures and everyday note-taking.