The Stalogy 4 Functions Pen has three colors of smooth ball-point ink in .5mm blue, black, red, and a .5mm mechanical pencil. It pairs wonderfully with Stalogy notebook paper. There's even an antibacterial agent in the grip.
The ballpoint pens are smooth and the ink colors are vivid. No need to press down hard when writing. The rubber grip is special, it has antibacterial properties.
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