Uni-Ball SN-220 Power Tank RT Eco Twist retractable ballpoint pen Black

0.4 mm, Refillable, Black Never before possible with conventional pens, the Power Tank RT can write clearly upside down, in minus temperatures and on wet paper without blurring. The ideal pen for those who work outside or enjoy outdoor leisure pursuits. Additional features are a comfortable grip that cushions fingers, a convenient retractable function for easy use in more challenging conditions and a useful ink supply monitor.