Schneider Ray Cartridge Rollerball Pen M (Medium), Refillable, Onyx Barrel, Royal Blue Erasable Ink Cartridge, Pack of 1 Pen (187807)

Smooth writer. It is my current carry pen. It comes with two short cartridges so you can carry a spare in the pen body if the cartridge runs out of ink. I had a long cartridge which I used instead. That is the cartridge in the picture. The cartridge can be refilled with a pen syringe, or a standard piston refill can be used if you have a spare. Very happy with the pen so far. I got it for note-taking and sketching.