Uni-Ball Air Roller Pen UNI UBA-188-M 0.5 blue

 
The UNI roller pen in a durable black and blue plastic body with a cap. The unique "UNI-ball AIR" tip allows you to adjust the intensity and thickness of writing depending on the pressure applied and angle. Ink color  is blue, line... thickness  ranges from 0.28 to 0.45 mm. Minimizes friction and contact with paper. Ensures sensationally smooth writing freely and quietly. Wear-resistant writing unit made of tungsten carbide. Ball diameter  is 0.7 mm. Perfect for calligraphy. There is no option to change the ink refill.