The Zebra Blen U is the latest innovation Zebra has made to the Blen family. And now, Zebra has expanded their lineup to include red ink and blue ink in sleek black pen bodies. The U still boasts a low center of gravity and a system that controls writing vibration and blurring, making your writing experience as stress-free as possible. But the Blen U is not simply a relaxing pen; it lends itself to confident, reliable writing and usability. Equipped with a strong and stylish binder clip and "S oil-based ink", the U is specifically designed to be your pen in unstable situations. Jotting down a quick note while running errands or brainstorming out of pocket with your Blen U will deliver strokes as bold and confident as your new idea, even with a light touch. Dense, smooth "S" oil-based ink, now available in classic Black, Blue and Red in both .5mm and .7mm tip sizes. Refill with the Zebra Blen U refill. Designed by Tokyo based design studio Nendo Durable binder clip for taking this pen on-the-go Reliable writing even while standing or in other unstable situations Brass weight placed in the tip of the pen lowers its center of gravity Stays more stable in your grip! Ergonomic design Your choice of Blue, Black, and Red ink options in both .5mm and .7mm