Uni-Ball Eye Micro Rollerball Pens have a unique design with a handy see through window which allows you to monitor how much ink is left | Contains a smooth writing rollerball nib in a durable stainless steel needle point | Provides greater control for detailed, precise strokes | Ideal for everyday writing and drawing | Smooth flowing liquid ink delivers a consistent writing experience | Features a window in the barrel so you check how much ink is left | Contain Uni Super Ink which is permanent, waterproof and fade proof once dry