This product features: Extreme conditions including wet surfaces, cool temperatures, and even upside down Uni-Ball Power Tank utilizes internal compressed air pressure to push out ink onto the paper. Revolving air inside allows it to continually push ink out until the end The oil based pigment ink is high density and comes out smooth and dark on paper/li> Pen also features a finely texturize grip composed of 0.16mm slits so that it not only fits comfortably in your hands but is also hard to slip away
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